Circumference of tires


How to Measure Bike Tire & Wheel Circumference

The circumference of a bike wheel is defined as the distance around the outside of the wheel. This distance includes the additional width that a tire brings to the wheel.

As you’re probably aware, wheel circumference is an important measurement for calibrating and ensuring the accuracy of a bike computer.

A bike computer, often referred to as a cyclometer, is a device that can provide detailed statistics on your bike rides, including the speed of your ride and the distance covered.

The majority of bike computers rely on counting a wheel’s rotations. So inputting the correct circumference is vital for accurate estimates of your speed and distance travelled.

To obtain the most accurate ride data possible, here are three easy ways to measure your wheel’s circumference.

For all of the below methods, ensure that your tire pressure is the same level you ride at.

Add a header to begin generating the table of contents

At the bottom of the article, I’ve also included a bike tire circumference chart that you can use to verify the circumference of any bike tire.  

Because cyclists have different preferences for tire pressure (PSI) and ride tires with varying amounts of wear, it’s essential to measure the circumference of your own tire.

Whilst a few millimetres of inaccuracy may seem marginal. However, over the duration of a long bike ride, any inaccuracy in tire circumference can significantly impact the accuracy of the data your bike computer provides. 

The 3 Best Methods for Measure Bike Tire Circumference

Method 1 - Diameter of Wheel Multiplied By Pi

This method involves calculations you’ll probably want to use a calculator for.

  1. Measure the radius of your bicycle wheel, from the lowest point of tire contact with the floor to the centre of your wheel skewer or thru-axle.
  2. Multiply your wheel radius by 2 to find your total wheel diameter.
  3. Multiply the wheel diameter by Pi (diameter x 3.14). 
  4. This final result is the circumference of your bike tire.

Formula for measuring bike wheel circumference: wheel diameter x 3. 14 = wheel circumference.

Method 2 - Dot to Dot (tape to tape)

The dot to dot method is very simple but can be inaccurate if the steps below aren’t followed closely.

  1. Stretch your tape measure to around four meters in a straight line and lay it along the ground.
  2. Apply a dot of washable/non-staining paint to the centre of your bike tire.
  3. Roll your bike parallel to the tape measure making sure it travels in a straight line.
  4. Once two paint dots are on the ground, stop rolling and leave your bike to one side.
  5. Using your tape measure, measure the distance between the two paint dots—the distance between these two spots to determine your wheel circumference. 

Method 3 - Wrap a Piece of String

  1. This method is significantly easier if you have an assistant to help you out. Otherwise, it can be quite fiddly!
  2. Take a ball of string and unwind it, so you have at least three meters unwound.
  3. Place one end of the string on the centre of the tire and hold it in place.  
  4. Ask your partner to wrap the string around the tire, ensuring it’s wrapped in a straight line. 
  5. Once the string returns to the starting position, either cut or mark the string where the two ends meet.
  6. Finally, use a tape measure to measure the total length of the piece of string. 
  7. The length of this piece of string is the circumference of your bike tire!

Bike Tire Circumference Chart

If you could find your tire size information on the side of your tire, search it below, and the table will reveal the standard circumference of tires of that size. 

This bike tire circumference chart is accurate and uses data on the circumferences of standardized tires sold worldwide. 

It’s important to understand, though, that there will always be a slight difference in circumference for each rider.

Some cyclists prefer riding with a lower PSI, which decreases tire circumference, whilst others will be riding morn worn tires.

To ensure you enter the most accurate figure into your bike computer, I recommend using one of the methods above, as this will provide you with the most precise measurement.

After all, there’s no point in having a bike computer if it isn’t correctly calibrated.

Tire Size ISO Size Circumference (meters) Circumference (mm)
700 x 18C 18-622 2.07 2070
700 x 19C 19-622 2.08 2080
700 x 20C 20-622 2. 086 2086
700 x 23C 23-622 2.096 2096
700 x 25C 25-622 2.105 2105
700C Tubular - 2.13 2130
700 x 28C 28-622 2.136 2136
700 x 30C 30-622 2. 146 2146
700 x 32C 32-622 2.155 2155
700 x 35C 35-622 2.168 2168
700 x 38C 38-622 2.18 2180
700 x 40C 40-622 2.2 2200
700 x 44C 44-622 2. 235 2235
700 x 45C 45-622 2.242 2242
700 x 47C 47-622 2.268 2268
650 x 20C 20-571 1.938 1938
650 x 23C 23-571 1.944 1944
650 x 35A 37-590 2. 09 2090
650 x 38B 40-584 2.105 2105
650 x 38A 40-590 2.125 2125
12" x 1.75" 47-203 0.935 935
12" x 1.95" 54-203 0.94 940
14" x 1.50" 40-254 1. 02 1020
14" x 1.75" 47-254 1.055 1055
16" x 1.50" 40-305 1.185 1185
16" x 1.75" 47-305 1.195 1195
16" x 2.00" 54-305 1.245 1245
16" x 1-1/8" 28-349 1. 29 1290
16" x 1-3/8" 37-349 1.3 1300
18" x 1.50" 40-355 1.34 1340
18" x 1.75" 47-355 1.35 1350
20" x 1.25" 32-406 1.45 1450
20" x 1.35" 35-406 1. 46 1460
20" x 1.50" 40-406 1.49 1490
20" x 1.75" 47-406 1.515 1515
20" x 1.95" 50-406 1.565 1565
20" x 1-1/8" 28-451 1.545 1545
20" x 1-3/8" 37-451 1. 615 1615
22" x 1-3/8" 37-501 1.77 1770
22" x 1-1/2" 40-501 1.785 1785
24" x 3/4" Tubular - 1.785 1785
24" x 1" 25-520 1.753 1753
24" x 1-1/8" 28-540 1. 795 1795
24" x 1-1/4" 32-540 1.905 1905
24" x 1.75" 47-507 1.89 1890
24" x 2.00" 50-507 1.925 1925
24" x 2.125" 54-507 1.965 1965
26" x 7/8" Tubular - 1. 92 1920
26" x 1.25" 32-559 1.95 1950
26" x 1.40" 37-559 2.005 2005
26" x 1.50" 40-559 2.01 2010
26" x 1.75" 47-559 2.023 2023
26" x 1.95" 50-559 2. 05 2050
26" x 2.00" 52-559 2.055 2055
26" x 2.1" 54-559 2.068 2068
26" x 2.125" 57-559 2.07 2070
26" x 2.35" 58-559 2.083 2083
26" x 3. 00" 75-559 2.17 2170
26" x 1-1.0" 25-559 1.913 1913
26" x 1" 25-571 1.952 1952
26" x 1-1/8" 28-590 1.97 1970
26" x 1-3/8" 37-590 2.068 2068
26" x 1-1/2" 37-584 2. 1 2100
27" x 1" 25-630 2.145 2145
27" x 1-1/8" 28-630 2.155 2155
27" x 1-1/4" 32-630 2.161 2161
27" x 1-3/8" 37-630 2.169 2169
27.5" x 1. 50" 40-584 2.079 2079
27.5" x 1.95" 50-584 2.09 2090
27.5" x 2.10" 54-584 2.148 2148
27.5" x 2.25" 57-584 2.182 2182
29" x 2.25" 58-622 2.281 2281
29" x 2. 1" 54-622 2.288 2288
29" x 2.2" 56-622 2.298 2298
29" x 2.3" 60-622 2.326 2326

Conclusion - How to Measure The Circumference of a Bike Tire

The information found above should have helped you correctly calibrate your bike computer. 

However, if for any reason you were unable to measure the circumference of your bike tire or didn’t understand something in this article, leave me a comment below, and I’ll get straight back to you. 

If you’re looking for a more detailed guide on bike wheel sizes, you can read the complete guide on wheel sizing here.  

As always, make sure you’re using a good quality bike lock to secure your bike when leaving it unattended. 

Lock it or lose it.

Ciao for now!

Tire Size Calculator

Tire Size Calculator Chart for 13" Wheels

21" Tire Diameter
185/60R13 = 21.7x7.3R13
215/50R13 = 21.5X8.5R13
225/45R13 = 21x8.9R13
225/50R13 = 21.9x8.9R13
255/40R13 = 21x10R13

22" Tire Diameter
155/80R13 = 22.8x6.1R13
175/70R13 = 22.6x6.9R13
205/60R13 = 22.7x8.1R13
22X8R13

23" Tire Diameter
165/80R13 = 23.4X6.5R13
185/70R13 = 23.2x7.3R13

24" Tire Diameter
175/80R13 = 24x6.9R13
185/80R13 = 24.7x7.3R13
24.5X8R13
24.5X9R13

Tire Size Calculator Chart for 14" Wheels

19" Tire Diameter
105/70R14 = 19.8X4.1R14

20" Tire Diameter
115/70R14 = 20.3X4.5R14
125/70R14 = 20.9X4.9R14

21" Tire Diameter
165/55R14 = 21.1X6. 5R14

22" Tire Diameter
135/80R14 = 22.5X5.3R14
165/65R14 = 22.4x6.5R14
185/55R14 = 22x7.3R14
185/60R14 = 22.7x7.3R14
195/55R14 = 22.4x7.7R14
205/50R14 = 22.1x8.1R14
205/55R14 = 22.9x8.1R14
225/50R14 = 22.9x8.9R14

23" Tire Diameter
175/65R14 = 23x6.9R14
175/70R14 = 23.6x6.9R14
185/65R14 = 23.5x7.3R14
195/60R14 = 23.2x7.7R14
205/60R14 = 23.7x8.1R14

24" Tire Diameter
185/70R14 = 24.2x7.3R14
185/75R14 = 24.9X7.3R14
195/65R14 = 24x7.7R14
195/70R14 = 24.7x7.7R14
215/60R14 = 24.2x8.5R14
225/60R14 = 24.6x8.9R14

25" Tire Diameter
185R14 = 25.7x7.3R14
195/75R14 = 25.5x7.7R14
205/70R14 = 25.3x8.1R14
215/70R14 = 25.9x8.5R14
235/60R14 = 25.1x9.3R14
245/60R14 = 25.6x9.6R14

26" Tire Diameter
195R14 = 26.2x7.8R14
205/75R14 = 26.1x8.1R14
215/75R14 = 26.7x8.5R14
225/70R14 = 26.4x8.9R14
26X8.5R14

27" Tire Diameter
205R14 = 27x8. 2R14
27X8.5R14
27X9.5R14

28" Tire Diameter
28X10R14

30" Tire Diameter
30X10R14

Tire Size Calculator Chart for 15" Wheels

20" Tire Diameter
105/70R15 = 20.8X4.1R15

21" Tire Diameter
115/70R15 = 21.3X4.5R15
125/70R15 = 21.9X4.9R15
165/50R15 = 21.5X6.5R15
195/45R15 = 21.9x7.7R15

22" Tire Diameter
125/80R15 = 22.9X4.9R15
145/65R15 = 22.4x5.7R15
155/60R15 = 22.3x6.1R15
165/60R15 = 22.8x6.5R15
175/55R15 = 22.6x6.9R15
195/50R15 = 22.7x7.7R15
22X8R15
22.5X4.5R15
245/40R15 = 22.7X9.6R15
275/35R15 = 22.6x10.8R15

23" Tire Diameter
135/80R15 = 23.5X5.3R15
165/65R15 = 23.4X6.5R15
175/60R15 = 23.3x6.9R15
185/55R15 = 23x7.3R15
185/60R15 = 23.7x7.3R15
195/55R15 = 23.4x7.7R15
205/50R15 = 23.1x8.1R15
205/55R15 = 23.9x8.1R15
225/45R15 = 23x8.9R15
225/50R15 = 23.9x8.9R15
295/35R15 = 23. 1X11.6R15

24" Tire Diameter
135/90R15 = 24.6X5.3R15
155/80R15 = 24.8X6.1R15
175/65R15 = 24x6.9R15
185/65R15 = 24.5x7.3R15
195/60R15 = 24.2x7.7R15
205/60R15 = 24.7x8.1R15
225/55R15 = 24.7x8.9R15
235/50R15 = 24.3x9.3R15
24X4.5R15
24X5R15
24.5X8R15
245/50R15 = 24.6x9.6R15
345/35R15 = 24.5x13.6R15

25" Tire Diameter
165/80R15 = 25.4X6.5R15
185/70R15 = 25.2x7.3R15
195/65R15 = 25x7.7R15
195/70R15 = 25.7x7.7R15
205/65R15 = 25.5x8.1R15
215/60R15 = 25.2x8.5R15
225/60R15 = 25.6x8.9R15
265/50R15 = 25.4X10.4R15
275/50R15 = 25.8x10.8R15

26" Tire Diameter
205/70R15 = 26.3x8.1R15
215/65R15 = 26x8.5R15
215/70R15 = 26.9x8.5R15
235/60R15 = 26.1x9.3R15
245/60R15 = 26.6x9.6R15
26X10R15
26X10.5R15
26X11.5R15
26X6R15
26X7.5R15
26X8R15
26X8.5R15
295/50R15 = 26.6x11.6R15

27" Tire Diameter
205/75R15 = 27.1x8. 1R15
215/75R15 = 27.7x8.5R15
225/70R15 = 27.4x8.9R15
255/60R15 = 27x10R15
27X10.5R15
27X9.5R15
27.5X4.5R15
295/55R15 = 27.8X11.6R15
325/50R15 = 27.8x12.8R15
E78-15 = 27x6.5R15

28" Tire Diameter
225/75R15 = 28.3x8.9R15
235/70R15 = 28x9.3R15
235/75R15 = 28.9x9.3R15
245/70R15 = 28.5X9.6R15
255/65R15 = 28.1x10R15
275/60R15 = 28x10.8R15
28X10.5R15
28X11.5R15
28X12.5R15
28X13.5R15
28X4.5R15
28X7.5R15
28X9R15

29" Tire Diameter
215/85R15 = 29.4X8.5R15
255/70R15 = 29.1x10R15
265/70R15 = 29.6x10.4R15
29X10.5R15
29X11.5R15
29X12.5R15
29X15.5R15
29X18R15
29X18.5R15
29X4.5R15
29X8.5R15
29.5X11.5R15
29.5X13.5R15
29.5X9R15
315/60R15 = 29.9x12.4R15
7R15 = 29.5x7.7R15

30" Tire Diameter
255/75R15 = 30.1x10R15
265/75R15 = 30.6x10.4R15
295/65R15 = 30.1x11.6R15
30X10R15
30X10.5R15
30X11. 5R15
30X12.5R15
30X13.5R15
30X7R15
30X9R15
30X9.5R15

31" Tire Diameter
31X10.5R15
31X11R15
31X11.5R15
31X12.5R15
31X13R15
31X13.5R15
31X14.5R15
31X16.5R15
31X18R15
31X18.5R15
31X9.5R15

32" Tire Diameter
32X10.5R15
32X11.5R15
32X14R15
32X16R15
32X17.5R15
32X18.5R15
32X9.5R15

33" Tire Diameter
33X10.5R15
33X11.5R15
33X12.5R15
33X13R15
33X13.5R15
33X14R15
33X14.5R15
33X15.5R15
33X16.5R15
33X19.5R15
33X21.5R15
33X9R15
33X9.5R15

34" Tire Diameter
34X10.5R15
34X12.5R15
34X9.5R15

35" Tire Diameter
35X10.5R15
35X12.5R15
35X13.5R15
35X14.5R15
35X15R15
35X15.5R15
35X16R15

36" Tire Diameter
36X12.5R15
36X13.5R15
36X14.5R15

37" Tire Diameter
37X12.5R15
37X13R15
37X13.5R15
37X14R15
37X14. 5R15

38" Tire Diameter
38X12.5R15
38X13R15
38X14.5R15
38X15.5R15
38.5X11R15
38.5X13.5R15
38.5X14.5R15
38.5X15R15
38.5X16R15

39" Tire Diameter
39X13.5R15
39.5X13.5R15
39.5X15R15
39.5X18R15

40" Tire Diameter
40X16R15

42" Tire Diameter
42X14R15
42X15R15
42.5X13.5R15

44" Tire Diameter
44X18.5R15
44X19.5R15
44X21R15

47" Tire Diameter
47X17R15

Tire Size Calculator Chart for 16" Wheels

22" Tire Diameter
125/70R16 = 22.9X4.9R16
175/50R16 = 22.9x6.9R16
195/40R16 = 22.1x7.7R16
195/45R16 = 22.9x7.7R16
205/40R16 = 22.5x8.1R16
215/35R16 = 21.9x8.5R16
215/40R16 = 22.8x8.5R16

23" Tire Diameter
125/80R16 = 23.9X4.9R16
135/70R16 = 23.4X5.3R16
175/55R16 = 23.6x6.9R16
185/50R16 = 23.3X7.3R16
195/50R16 = 23.7x7.7R16
205/45R16 = 23.3x8.1R16
215/45R16 = 23. 6x8.5R16

24" Tire Diameter
125/85R16 = 24.4X4.9R16
125/90R16 = 24.9X4.9R16
135/80R16 = 24.5X5.3R16
175/60R16 = 24.3x6.9R16
185/55R16 = 24x7.3R16
185/60R16 = 24.7X7.3R16
195/55R16 = 24.4x7.7R16
205/50R16 = 24.1x8.1R16
205/55R16 = 24.9x8.1R16
215/50R16 = 24.5X8.5R16
225/45R16 = 24x8.9R16
225/50R16 = 24.9x8.9R16
245/45R16 = 24.7x9.6R16

25" Tire Diameter
135/90R16 = 25.6X5.3R16
145/80R16 = 25.1X5.7R16
195/60R16 = 25.2x7.7R16
205/60R16 = 25.7x8.1R16
215/55R16 = 25.3x8.5R16
225/55R16 = 25.7x8.9R16
245/50R16 = 25.6x9.6R16
265/45R16 = 25.4X10.4R16
275/45R16 = 25.7x10.8R16
315/40R16 = 25.9X12.4R16

26" Tire Diameter
145/90R16 = 26.3X5.7R16
145/90R16 = 26.3X5.7R16
195/65R16 = 26X7.7R16
205/65R16 = 26.5x8.1R16
215/60R16 = 26.2x8.5R16
225/60R16 = 26.6x8.9R16
235/55R16 = 26.2x9.3R16
255/50R16 = 26x10R16
26X11.5R16

27" Tire Diameter
155/90R16 = 27X6. 1R16
195/75R16 = 27.5x7.7R16
205/70R16 = 27.3x8.1R16
215/65R16 = 27x8.5R16
215/70R16 = 27.9x8.5R16
225/65R16 = 27.5x8.9R16
235/60R16 = 27.1x9.3R16
295/50R16 = 27.6x11.6R16
355/40R16 = 27.2X14R16

28" Tire Diameter
195/80R16 = 28.3x7.7R16
205/75R16 = 28.1X8.1R16
205/80R16 = 28.9x8.1R16
215/75R16 = 28.7x8.5R16
225/70R16 = 28.4x8.9R16
235/65R16 = 28x9.3R16
255/60R16 = 28x10R16
28X11.5R16

29" Tire Diameter
225/75R16 = 29.3x8.9R16
235/70R16 = 29x9.3R16
235/75R16 = 29.9x9.3R16
245/70R16 = 29.5x9.6R16
255/65R16 = 29.1x10R16
275/60R16 = 29X10.8R16
285/60R16 = 29.5X11.2R16

30" Tire Diameter
215/85R16 = 30.4x8.5R16
235/80R16 = 30.8x9.3R16
245/75R16 = 30.5x9.6R16
255/70R16 = 30.1x10R16
265/70R16 = 30.6x10.4R16
285/65R16 = 30.6X11.2R16
30X11.5R16

31" Tire Diameter
225/85R16 = 31.1X8.9R16
235/85R16 = 31.7x9.3R16
265/75R16 = 31. 6x10.4R16
275/70R16 = 31.2x10.8R16
285/70R16 = 31.7x11.2R16
31X10.5R16
31X11R16
31X11.5R16
31X12.5R16
7.5R16 = 31.8x8.7R16

32" Tire Diameter
265/80R16 = 32.7X10.4R16
285/75R16 = 32.8x11.2R16
305/70R16 = 32.8x12R16
32X10R16
32X11.5R16
32X9R16

33" Tire Diameter
255/85R16 = 33.1x10R16
295/75R16 = 33.4x11.6R16
33X10.5R16
33X11.5R16
33X12.5R16
33X13R16
33X13.5R16
33X14R16
33X14.5R16
33X9.5R16
33.5X16.5R16

34" Tire Diameter
315/75R16 = 34.6x12.4R16
34X10.5R16
34X12.5R16
34X13.5R16
34X9R16
34.5X17R16

35" Tire Diameter
35X10.5R16
35X12.5R16
35X14.5R16
35X15R16
35X16R16
375/65R16 = 35.2x14.8R16

36" Tire Diameter
325/80R16 = 36.5x12.8R16
345/75R16 = 36.4x13.6R16
36X12.5R16
36X13R16
36X13.5R16
36X14.5R16

37" Tire Diameter
365/75R16 = 37. 6x14.4R16
37X12.5R16
37X13R16
37X13.5R16
37X14R16
37X14.5R16
385/70R16 = 37.2x15.2R16
395/70R16 = 37.8x15.6R16

38" Tire Diameter
38X13R16
38X14.5R16
38X15.5R16
38.5X11R16
38.5X13.5R16
38.5X14.5R16
38.5X15R16

39" Tire Diameter
39X13.5R16
39.5X13.5R16
39.5X15R16

40" Tire Diameter
40X16R16

41" Tire Diameter
41X14.5R16

42" Tire Diameter
42X14R16
42X15R16
42.5X13.5R16

44" Tire Diameter
44X19.5R16
44X21R16

46" Tire Diameter
46X19.5R16

Tire Size Calculator Chart for 16.5" Wheels

29" Tire Diameter
8.75R16.5 = 29.5x8.8R16.5

30" Tire Diameter
9.5R16.5 = 30.6x9.5R16.5

32" Tire Diameter
32X12R16.5

33" Tire Diameter
33X11.5R16.5
33X12.5R16.5
33X14R16.5
33X14.5R16.5
33X15.5R16.5

35" Tire Diameter
35X12. 5R16.5
35X14.5R16.5
35X15R16.5
35X15.5R16.5
35X16R16.5
35X9.5R16.5

36" Tire Diameter
36X12.5R16.5
36X13.5R16.5
36X14.5R16.5
36X16R16.5

37" Tire Diameter
37X12.5R16.5
37X13R16.5
37X14R16.5

38" Tire Diameter
38X11R16.5
38X12.5R16.5
38X15.5R16.5
38.5X11R16.5
38.5X13.5R16.5
38.5X14.5R16.5
38.5X15R16.5
38.5X16R16.5

39" Tire Diameter
39X13.5R16.5
39.5X13.5R16.5
39.5X15R16.5
39.5X18R16.5

42" Tire Diameter
42X14R16.5
42X15R16.5
42.5X13.5R16.5

43" Tire Diameter
43X14.5R16.5

44" Tire Diameter
44X18.5R16.5
44X18.5R16.5
44X19.5R16.5
44X21R16.5

47" Tire Diameter
47X17R16.5

48" Tire Diameter
48X12.5R16.5

49" Tire Diameter
49X21R16.5

Tire Size Calculator Chart for 17" Wheels

22" Tire Diameter
22X2. 5R17

23" Tire Diameter
125/70R17 = 23.9X4.9R17
195/40R17 = 23.1x7.7R17
195/45R17 = 23.9x7.7R17
205/40R17 = 23.5x8.1R17
215/35R17 = 22.9x8.5R17
215/40R17 = 23.8x8.5R17
225/35R17 = 23.2x8.9R17
245/35R17 = 23.8x9.6R17

24" Tire Diameter
125/80R17 = 24.9X4.9R17
135/70R17 = 24.4X5.3R17
205/45R17 = 24.3x8.1R17
215/45R17 = 24.6x8.5R17
225/40R17 = 24.1x8.9R17
235/40R17 = 24.4x9.3R17
245/40R17 = 24.7x9.6R17
275/35R17 = 24.6x10.8R17

25" Tire Diameter
115/95R17 = 25.6X4.5R17
135/80R17 = 25.5X5.3R17
145/70R17 = 25X5.7R17
155/70R17 = 25.5X6.1R17
205/50R17 = 25.1x8.1R17
205/55R17 = 25.9x8.1R17
215/50R17 = 25.5X8.5R17
225/45R17 = 25x8.9R17
225/50R17 = 25.9x8.9R17
235/45R17 = 25.3x9.3R17
245/45R17 = 25.7x9.6R17
255/40R17 = 25x10R17
265/40R17 = 25.3x10.4R17
275/40R17 = 25.7x10.8R17
295/35R17 = 25.1x11.6R17
315/35R17 = 25.7x12.4R17

26" Tire Diameter
135/90R17 = 26. 6X5.3R17
145/80R17 = 26.1X5.7R17
155/80R17 = 26.8X6.1R17
215/55R17 = 26.3x8.5R17
225/55R17 = 26.7x8.9R17
235/50R17 = 26.3x9.3R17
245/50R17 = 26.6x9.6R17
255/45R17 = 26x10R17
26X11.5R17
285/40R17 = 26x11.2R17
295/40R17 = 26.3x11.6R17
335/35R17 = 26.2x13.2R17

27" Tire Diameter
145/90R17 = 27.3X5.7R17
165/80R17 = 27.4X6.5R17
215/60R17 = 27.2x8.5R17
225/60R17 = 27.6x8.9R17
235/55R17 = 27.2x9.3R17
245/55R17 = 27.6x9.6R17
255/50R17 = 27x10R17
275/50R17 = 27.8X10.8R17
305/45R17 = 27.8X12R17
345/40R17 = 27.9x13.6R17

28" Tire Diameter
155/90R17 = 28X6.1R17
165/90R17 = 28.7X6.5R17
215/65R17 = 28x8.5R17
215/70R17 = 28.9x8.5R17
225/65R17 = 28.5x8.9R17
235/60R17 = 28.1x9.3R17
245/60R17 = 28.6X9.6R17
255/55R17 = 28x10R17
275/55R17 = 28.9x10.8R17

29" Tire Diameter
175/90R17 = 29.4X6.9R17
225/70R17 = 29.4x8.9R17
235/65R17 = 29x9. 3R17
245/65R17 = 29.5x9.6R17
255/60R17 = 29x10R17
265/60R17 = 29.5x10.4R17

30" Tire Diameter
225/75R17 = 30.3x8.9R17
235/70R17 = 30x9.3R17
235/75R17 = 30.9x9.3R17
245/70R17 = 30.5x9.6R17
255/65R17 = 30.1x10R17
265/65R17 = 30.6x10.4R17
275/60R17 = 30x10.8R17
285/60R17 = 30.5X11.2R17

31" Tire Diameter
235/80R17 = 31.8x9.3R17
245/75R17 = 31.5x9.6R17
255/70R17 = 31.1x10R17
265/70R17 = 31.6x10.4R17
275/65R17 = 31.1x10.8R17
285/65R17 = 31.6x11.2R17
31X10.5R17

32" Tire Diameter
235/85R17 = 32.7X9.3R17
255/75R17 = 32.1x10R17
275/70R17 = 32.2x10.8R17
285/70R17 = 32.7x11.2R17
305/65R17 = 32.6x12R17
32X10.5R17
32X11.5R17

33" Tire Diameter
255/80R17 = 33.1x10R17
285/75R17 = 33.8x11.2R17
295/70R17 = 33.3x11.6R17
305/70R17 = 33.8x12R17
33X10.5R17
33X12.5R17
33X13R17
33X13.5R17
33X9.5R17

34" Tire Diameter
275/80R17 = 34. 3X10.8R17
315/70R17 = 34.4x12.4R17
325/70R17 = 34.9x12.8R17
34X10.5R17

35" Tire Diameter
35X10.5R17
35X11.5R17
35X12.5R17
35X13.5R17
35X14.5R17

36" Tire Diameter
355/70R17 = 36.6x14R17
36X12.5R17
36X13.5R17

37" Tire Diameter
37X12.5R17
37X13R17
37X13.5R17
37X14R17

38" Tire Diameter
38X13.5R17
38X14.5R17
38X15.5R17
38.5X13.5R17
38.5X14.5R17

39" Tire Diameter
39X13.5R17
39.5X13.5R17
39.5X15R17

40" Tire Diameter
40X13.5R17
40X14.5R17
40X16R17

41" Tire Diameter
41X14.5R17

42" Tire Diameter
42X14R17
42X14.5R17
42X15R17
42.5X13.5R17

43" Tire Diameter
43X14.5R17

44" Tire Diameter
44X19.5R17
44X21R17

47" Tire Diameter
47X17R17

49" Tire Diameter
49X21R17

54" Tire Diameter
54X19. 5R17

Tire Size Calculator Chart for 18" Wheels

23" Tire Diameter
215/35R18 = 23.9x8.5R18

24" Tire Diameter
125/70R18 = 24.9X4.9R18
205/40R18 = 24.5x8.1R18
215/40R18 = 24.8x8.5R18
225/35R18 = 24.2x8.9R18
235/35R18 = 24.5x9.3R18
245/35R18 = 24.8x9.6R18
285/30R18 = 24.7x11.2R18

25" Tire Diameter
135/70R18 = 25.4X5.3R18
155/60R18 = 25.3X6.1R18
215/45R18 = 25.6x8.5R18
225/40R18 = 25.1x8.9R18
235/40R18 = 25.4x9.3R18
245/40R18 = 25.7x9.6R18
255/35R18 = 25x10R18
265/35R18 = 25.3x10.4R18
275/35R18 = 25.6x10.8R18
285/35R18 = 25.9x11.2R18
295/30R18 = 25x11.6R18
305/30R18 = 25.2x12R18
315/30R18 = 25.4x12.4R18
335/30R18 = 25.9x13.2R18

26" Tire Diameter
135/80R18 = 26.5X5.3R18
145/70R18 = 26X5.7R18
215/50R18 = 26.5X8.5R18
225/45R18 = 26x8.9R18
225/50R18 = 26.9x8.9R18
235/45R18 = 26.3x9.3R18
245/45R18 = 26.7x9.6R18
255/40R18 = 26x10R18
26X12R18
265/40R18 = 26. 3x10.4R18
275/40R18 = 26.7x10.8R18
295/35R18 = 26.1x11.6R18
305/35R18 = 26.4x12R18
315/35R18 = 26.7x12.4R18
345/30R18 = 26.1x13.6R18

27" Tire Diameter
145/80R18 = 27.1X5.7R18
145/85R18 = 27.7X5.7R18
215/55R18 = 27.3x8.5R18
225/55R18 = 27.7x8.9R18
235/50R18 = 27.3x9.3R18
245/50R18 = 27.6x9.6R18
255/45R18 = 27x10R18
265/45R18 = 27.4x10.4R18
275/45R18 = 27.7x10.8R18
285/40R18 = 27x11.2R18
295/40R18 = 27.3x11.6R18
305/40R18 = 27.6X12R18
315/40R18 = 27.9x12.4R18
325/35R18 = 27x12.8R18
345/35R18 = 27.5x13.6R18

28" Tire Diameter
155/85R18 = 28.4X6.1R18
225/60R18 = 28.6x8.9R18
235/55R18 = 28.2x9.3R18
245/55R18 = 28.6x9.6R18
255/50R18 = 28x10R18
265/50R18 = 28.4X10.4R18
285/45R18 = 28.1x11.2R18
295/45R18 = 28.5x11.6R18
305/45R18 = 28.8X12R18

29" Tire Diameter
155/90R18 = 29X6.1R18
165/90R18 = 29.7X6.5R18
225/65R18 = 29.5X8. 9R18
235/60R18 = 29.1x9.3R18
245/60R18 = 29.6x9.6R18
255/55R18 = 29x10R18
265/55R18 = 29.5X10.4R18
275/55R18 = 29.9x10.8R18
285/50R18 = 29.2x11.2R18
325/45R18 = 29.5X12.8R18

30" Tire Diameter
175/90R18 = 30.4X6.9R18
235/65R18 = 30x9.3R18
245/65R18 = 30.5x9.6R18
255/60R18 = 30x10R18
265/60R18 = 30.5x10.4R18
285/55R18 = 30.3x11.2R18

31" Tire Diameter
235/70R18 = 31X9.3R18
255/65R18 = 31.1x10R18
265/65R18 = 31.6x10.4R18
275/60R18 = 31x10.8R18
285/60R18 = 31.5x11.2R18

32" Tire Diameter
255/70R18 = 32.1x10R18
265/70R18 = 32.6x10.4R18
275/65R18 = 32.1x10.8R18
285/65R18 = 32.6x11.2R18
305/60R18 = 32.4x12R18

33" Tire Diameter
275/70R18 = 33.2x10.8R18
285/70R18 = 33.7x11.2R18
295/65R18 = 33.1x11.6R18
305/65R18 = 33.6x12R18
325/60R18 = 33.4x12.8R18
33X10.5R18
33X11.5R18
33X12.5R18
33X13R18
33X13.5R18

34" Tire Diameter
285/75R18 = 34. 8x11.2R18
295/70R18 = 34.3X11.6R18
305/70R18 = 34.8x12R18
325/65R18 = 34.6x12.8R18
34X12.5R18

35" Tire Diameter
315/70R18 = 35.4x12.4R18
35X11.5R18
35X12.5R18
35X13R18
35X13.5R18
35X14.5R18

36" Tire Diameter
355/65R18 = 36.2x14R18
36X13.5R18

37" Tire Diameter
37X11.5R18
37X12.5R18
37X13.5R18

38" Tire Diameter
38X13.5R18
38X14.5R18
38X15R18
38X15.5R18
38.5X14.5R18

40" Tire Diameter
40X13.5R18
40X14.5R18

41" Tire Diameter
41X14.5R18

Tire Size Calculator Chart for 19" Wheels

24" Tire Diameter
215/35R19 = 24.9x8.5R19
235/30R19 = 24.6x9.3R19
245/30R19 = 24.8x9.6R19
295/25R19 = 24.8X11.6R19

25" Tire Diameter
115/70R19 = 25.3X4.5R19
125/70R19 = 25.9X4.9R19
225/35R19 = 25.2x8.9R19
235/35R19 = 25.5x9.3R19
245/35R19 = 25.8x9.6R19
255/30R19 = 25x10R19
265/30R19 = 25. 3x10.4R19
275/30R19 = 25.5x10.8R19
285/30R19 = 25.7x11.2R19
315/25R19 = 25.2x12.4R19

26" Tire Diameter
135/70R19 = 26.4X5.3R19
225/40R19 = 26.1x8.9R19
235/40R19 = 26.4x9.3R19
245/40R19 = 26.7x9.6R19
255/35R19 = 26x10R19
265/35R19 = 26.3x10.4R19
275/35R19 = 26.6x10.8R19
285/35R19 = 26.9x11.2R19
295/30R19 = 26x11.6R19
305/30R19 = 26.2x12R19
315/30R19 = 26.4x12.4R19
325/30R19 = 26.7x12.8R19
335/30R19 = 26.9x13.2R19

27" Tire Diameter
155/70R19 = 27.5x6.1R19
175/60R19 = 27.3x6.9R19
225/45R19 = 27x8.9R19
235/45R19 = 27.3x9.3R19
245/45R19 = 27.7x9.6R19
255/40R19 = 27x10R19
265/40R19 = 27.3x10.4R19
275/40R19 = 27.7x10.8R19
295/35R19 = 27.1x11.6R19
305/35R19 = 27.4X12R19
315/35R19 = 27.7x12.4R19
345/30R19 = 27.1x13.6R19
355/30R19 = 27.4x14R19

28" Tire Diameter
145/80R19 = 28.1X5.7R19
155/80R19 = 28.8X6.1R19
225/55R19 = 28. 7x8.9R19
235/50R19 = 28.3x9.3R19
245/50R19 = 28.6x9.6R19
255/45R19 = 28x10R19
265/45R19 = 28.4X10.4R19
275/45R19 = 28.7x10.8R19
285/40R19 = 28x11.2R19
295/40R19 = 28.3X11.6R19
315/40R19 = 28.9x12.4R19
345/35R19 = 28.5x13.6R19

29" Tire Diameter
235/55R19 = 29.2x9.3R19
245/55R19 = 29.6x9.6R19
255/50R19 = 29x10R19
265/50R19 = 29.4x10.4R19
275/50R19 = 29.8X10.8R19
285/45R19 = 29.1x11.2R19
295/45R19 = 29.5x11.6R19

30" Tire Diameter
165/90R19 = 30.7X6.5R19
175/80R19 = 30X6.9R19
255/55R19 = 30x10R19
265/55R19 = 30.5x10.4R19
275/55R19 = 30.9x10.8R19

31" Tire Diameter
235/65R19 = 31X9.3R19
255/60R19 = 31x10R19

Tire Size Calculator Chart for 20" Wheels

25" Tire Diameter
215/30R20 = 25.1X8.5R20
225/30R20 = 25.3x8.9R20
235/30R20 = 25.6x9.3R20
245/30R20 = 25.8x9.6R20
275/25R20 = 25.4X10.8R20
285/25R20 = 25.6x11.2R20
295/25R20 = 25. 8x11.6R20

26" Tire Diameter
145/60R20 = 26.9X5.7R20
225/35R20 = 26.2x8.9R20
235/35R20 = 26.5x9.3R20
245/35R20 = 26.8x9.6R20
255/30R20 = 26x10R20
265/30R20 = 26.3x10.4R20
275/30R20 = 26.5x10.8R20
285/30R20 = 26.7x11.2R20
305/25R20 = 26x12R20
315/25R20 = 26.2x12.4R20
325/25R20 = 26.4x12.8R20
335/25R20 = 26.6x13.2R20
345/25R20 = 26.8X13.6R20

27" Tire Diameter
155/60R20 = 27.3x6.1R20
155/65R20 = 27.9X6.1R20
165/60R20 = 27.8X6.5R20
175/55R20 = 27.6x6.9R20
195/50R20 = 27.7x7.7R20
215/45R20 = 27.6x8.5R20
225/40R20 = 27.1X8.9R20
235/40R20 = 27.4x9.3R20
245/40R20 = 27.7x9.6R20
255/35R20 = 27x10R20
265/35R20 = 27.3x10.4R20
275/35R20 = 27.6x10.8R20
285/35R20 = 27.9x11.2R20
295/30R20 = 27x11.6R20
305/30R20 = 27.2x12R20
315/30R20 = 27.4x12.4R20
325/30R20 = 27.7x12.8R20
335/30R20 = 27.9x13.2R20

28" Tire Diameter
225/45R20 = 28X8. 9R20
235/45R20 = 28.3x9.3R20
245/45R20 = 28.7x9.6R20
255/40R20 = 28x10R20
265/40R20 = 28.3x10.4R20
275/40R20 = 28.7x10.8R20
295/35R20 = 28.1x11.6R20
305/35R20 = 28.4x12R20
315/35R20 = 28.7x12.4R20
345/30R20 = 28.1x13.6R20

29" Tire Diameter
235/50R20 = 29.3X9.3R20
245/50R20 = 29.6x9.6R20
255/45R20 = 29x10R20
265/45R20 = 29.4x10.4R20
275/45R20 = 29.7x10.8R20
285/40R20 = 29x11.2R20
295/40R20 = 29.3x11.6R20
305/40R20 = 29.6X12R20
325/35R20 = 29X12.8R20

30" Tire Diameter
235/55R20 = 30.2x9.3R20
255/50R20 = 30x10R20
265/50R20 = 30.4x10.4R20
275/50R20 = 30.8x10.8R20
285/45R20 = 30.1X11.2R20
295/45R20 = 30.5x11.6R20
305/45R20 = 30.8x12R20

31" Tire Diameter
245/60R20 = 31.6x9.6R20
255/55R20 = 31x10R20
275/55R20 = 31.9x10.8R20
285/50R20 = 31.2x11.2R20
295/50R20 = 31.6x11.6R20
31X18R20

32" Tire Diameter
265/60R20 = 32. 5x10.4R20
285/55R20 = 32.3x11.2R20
295/55R20 = 32.8X11.6R20
305/50R20 = 32x12R20
315/50R20 = 32.4x12.4R20
325/50R20 = 32.8x12.8R20

33" Tire Diameter
275/60R20 = 33x10.8R20
285/60R20 = 33.5x11.2R20
295/60R20 = 33.9X11.6R20
305/55R20 = 33.2x12R20
33X11.5R20
33X12R20
33X12.5R20
33X13.5R20

34" Tire Diameter
275/65R20 = 34.1x10.8R20
285/65R20 = 34.6x11.2R20
305/60R20 = 34.4x12R20
315/60R20 = 34.9x12.4R20
355/50R20 = 34X14R20

35" Tire Diameter
295/65R20 = 35.1X11.6R20
325/60R20 = 35.4x12.8R20
35X11.5R20
35X12.5R20
35X13R20
35X13.5R20
35X14.5R20

36" Tire Diameter
355/60R20 = 36.8x14R20
36X13.5R20
36X15.5R20

37" Tire Diameter
37X11.5R20
37X12.5R20
37X13.5R20
37X14.5R20

38" Tire Diameter
38X13.5R20
38X14.5R20
38X15.5R20
38.5X13.5R20
38.5X14.5R20

39" Tire Diameter
39X13. 5R20
39.5X13.5R20
39.5X15R20

40" Tire Diameter
40X13.5R20
40X14.5R20
40X15.5R20

41" Tire Diameter
41X14.5R20

42" Tire Diameter
42X14.5R20
42X15R20
42.5X13.5R20

43" Tire Diameter
43X14.5R20

44" Tire Diameter
44X19.5R20
44X19.5R20
44X21R20

45" Tire Diameter
45X14.5R20

46" Tire Diameter
46X19.5R20

49" Tire Diameter
49X21R20

54" Tire Diameter
54X19.5R20

Tire Size Calculator Chart for 21" Wheels

26" Tire Diameter
245/30R21 = 26.8x9.6R21
295/25R21 = 26.8x11.6R21

27" Tire Diameter
245/35R21 = 27.8x9.6R21
255/30R21 = 27x10R21
265/30R21 = 27.3x10.4R21
275/30R21 = 27.5x10.8R21
285/30R21 = 27.7x11.2R21
305/25R21 = 27x12R21
325/25R21 = 27.4x12.8R21

28" Tire Diameter
245/40R21 = 28.7x9.6R21
255/35R21 = 28X10R21
265/35R21 = 28. 3x10.4R21
275/35R21 = 28.6x10.8R21
285/35R21 = 28.9x11.2R21
295/30R21 = 28x11.6R21
305/30R21 = 28.2x12R21
315/30R21 = 28.4X12.4R21
325/30R21 = 28.7x12.8R21
355/25R21 = 28x14R21

29" Tire Diameter
245/45R21 = 29.7X9.6R21
255/40R21 = 29X10R21
265/40R21 = 29.3x10.4R21
275/40R21 = 29.7x10.8R21
295/35R21 = 29.1x11.6R21
305/35R21 = 29.4X12R21
315/35R21 = 29.7X12.4R21

30" Tire Diameter
265/45R21 = 30.4x10.4R21
275/45R21 = 30.7x10.8R21
285/40R21 = 30X11.2R21
295/40R21 = 30.3x11.6R21
315/40R21 = 30.9X12.4R21

31" Tire Diameter
255/50R21 = 31x10R21
275/50R21 = 31.8X10.8R21
285/45R21 = 31.1x11.2R21
325/40R21 = 31.2X12.8R21

Tire Size Calculator Chart for 22" Wheels

27" Tire Diameter
235/30R22 = 27.6x9.3R22
245/30R22 = 27.8x9.6R22
275/25R22 = 27.4x10.8R22
285/25R22 = 27.6x11.2R22
295/25R22 = 27.8x11.6R22

28" Tire Diameter
255/30R22 = 28x10R22
265/30R22 = 28. 3x10.4R22
275/30R22 = 28.5X10.8R22
285/30R22 = 28.7x11.2R22
305/25R22 = 28x12R22
315/25R22 = 28.2x12.4R22
335/25R22 = 28.6x13.2R22

29" Tire Diameter
255/35R22 = 29x10R22
265/35R22 = 29.3x10.4R22
275/35R22 = 29.6X10.8R22
285/35R22 = 29.9x11.2R22
295/30R22 = 29x11.6R22
305/30R22 = 29.2x12R22
315/30R22 = 29.4X12.4R22

30" Tire Diameter
255/40R22 = 30X10R22
265/40R22 = 30.3x10.4R22
275/40R22 = 30.7x10.8R22
295/35R22 = 30.1X11.6R22
305/35R22 = 30.4X12R22
315/35R22 = 30.7X12.4R22

31" Tire Diameter
255/45R22 = 31X10R22
265/45R22 = 31.4X10.4R22
275/45R22 = 31.7x10.8R22
285/40R22 = 31x11.2R22
295/40R22 = 31.3x11.6R22
305/40R22 = 31.6x12R22
325/35R22 = 31X12.8R22

32" Tire Diameter
275/50R22 = 32.8x10.8R22
285/45R22 = 32.1x11.2R22
305/45R22 = 32.8x12R22

33" Tire Diameter
285/50R22 = 33.2x11.2R22
33X12. 5R22
33X14.5R22
355/40R22 = 33.2X14R22

34" Tire Diameter
285/55R22 = 34.3X11.2R22
295/55R22 = 34.8X11.6R22
305/50R22 = 34x12R22
325/50R22 = 34.8x12.8R22

35" Tire Diameter
35X12.5R22
35X14.5R22
35X15.5R22
375/45R22 = 35.3X14.8R22

36" Tire Diameter
325/55R22 = 36.1x12.8R22
335/55R22 = 36.5X13.2R22

37" Tire Diameter
325/60R22 = 37.4x12.8R22
37X12.5R22
37X13.5R22

38" Tire Diameter
355/60R22 = 38.8x14R22
38X13.5R22
38X15.5R22

40" Tire Diameter
40X14.5R22
40X15.5R22

41" Tire Diameter
41X14.5R22

42" Tire Diameter
42.5X13.5R22

Tire Size Calculator Chart for 23" Wheels

28" Tire Diameter
265/25R23 = 28.2X10.4R23

30" Tire Diameter
285/35R23 = 30.9x11.2R23
325/30R23 = 30.7X12.8R23

31" Tire Diameter
275/40R23 = 31.7X10. 8R23

32" Tire Diameter
285/40R23 = 32x11.2R23
305/40R23 = 32.6x12R23
325/35R23 = 32X12.8R23

Tire Size Calculator Chart for 24" Wheels

29" Tire Diameter
275/25R24 = 29.4x10.8R24

30" Tire Diameter
255/30R24 = 30x10R24
275/30R24 = 30.5x10.8R24
285/30R24 = 30.7x11.2R24

31" Tire Diameter
285/35R24 = 31.9x11.2R24
295/30R24 = 31X11.6R24

32" Tire Diameter
295/35R24 = 32.1x11.6R24
305/35R24 = 32.4x12R24
315/35R24 = 32.7x12.4R24
405/25R24 = 32x15.9R24

33" Tire Diameter
285/40R24 = 33x11.2R24
295/40R24 = 33.3x11.6R24

34" Tire Diameter
385/35R24 = 34.6x15.2R24

35" Tire Diameter
325/45R24 = 35.5x12.8R24
35X12.5R24
35X13.5R24
375/40R24 = 35.8X14.8R24

36" Tire Diameter
315/50R24 = 36.4X12.4R24

37" Tire Diameter
37X13.5R24
37X14.5R24

38" Tire Diameter
38X13. 5R24
38X14R24
38X15.5R24

40" Tire Diameter
40X13.5R24
40X14.5R24
40X15.5R24

42" Tire Diameter
42X15.5R24

Tire Size Calculator Chart for 26" Wheels

31" Tire Diameter
275/25R26 = 31.4x10.8R26
295/25R26 = 31.8x11.6R26

33" Tire Diameter
295/30R26 = 33x11.6R26
305/30R26 = 33.2x12R26

35" Tire Diameter
315/40R26 = 35.9x12.4R26

37" Tire Diameter
37X13.5R26

38" Tire Diameter
38X15.5R26

40" Tire Diameter
40X13.5R26
40X15.5R26

42" Tire Diameter
42X15.5R26

Tire Size Calculator Chart for 28" Wheels

33" Tire Diameter
295/25R28 = 33.8x11.6R28

37" Tire Diameter
325/35R28 = 37x12.8R28

40" Tire Diameter
40X15.5R28

42" Tire Diameter
42X15.5R28

Tire Size Calculator Chart for 30" Wheels

37" Tire Diameter
315/30R30 = 37. 4x12.4R30

Tire calculator online - visual tire calculator.

Tire calculator

Your machine size

/ 253035404550556065707580859095100 R 121314151617181920212222.52324

Calculate

135145155165175185195205215225235245255265275285295305315325335345355365375385395 / 253035404550556065707580859095100 R 121314151617181920212222.52324
nine0010 New tire size

CM INCHES


nine0006 - nine0013
Index Old New Difference
Diameter - - -
Width - -
Circumference - - -
Profile height - - -
RPM - - -
Change in ground clearance -
Result: -

With speedometer:

Real speed will be:

Visual tire calculator

When factory tires wear out or you just want to put on other wheels, the question arises: what tire sizes will fit my car? The fact is that each car is designed for a certain wheel diameter and tread width. Usually, this information is contained on the back of the gas tank cap or in the operating documents. If you deviate from these sizes by more than 2-3 percent, then gas mileage will increase, the speedometer will begin to lie, and in case of a large difference, driving can become simply dangerous. nine0011

But how to choose the right size tires if there are some incomprehensible numbers written on the profile? Do not measure them with a ruler, by God. It is for these purposes that this tire calculator was created. It allows you to determine the difference between tires in centimeters, inches and percentages. In particular, with the tire calculator you can calculate and compare tire diameter, tread width, profile height and circumference. Additionally, the calculator detects potential differences in speedometer readings, ground clearance changes, and differences in revolutions per kilometer (or mile). nine0011

Calculator displays visual differences in tire diameter, profile, clearance and width. On the right side, a dynamic wheel pattern is generated, with a dotted pattern and parameters. At the top is a visual representation of the old tire (original size), and at the bottom is your potential new tire. The picture is displayed in two projections: lateral and frontal. Both can be downloaded to a computer in png format. To do this, right-click on the image and select "Save As...". nine0011

How to use the online tire calculator?

Using the virtual tire calculator is very easy. There are drop-down boxes in the upper left corner of the application. In the top row, you need to select the size of your original factory tire (or just the tires that are on your car at the moment). You can simply look at these indicators on the tire profile (side surface). The first field is the tire width in millimeters. The second field is the ratio of the profile height to the tire width in percent. The third field is the disc diameter in inches. nine0011

In the second row, you need to enter the size of the new tires, i. e. those tires that you are going to buy or have already bought. After that, click on the green "Calculate" button. The tire calculator will instantly calculate the differences between tires and display them in a table. Namely: diameter, width, circumference and height of the tire profile, the number of revolutions per kilometer and changes in ground clearance. The first two columns of the table will display the parameters of old and new tires, and the third column will show the nominal and percentage difference between them. Our recommendation will be displayed at the very bottom of the table. If the difference in diameters exceeds 3%, then we strongly do not recommend installing such tires, as this can be dangerous. nine0011

At the very bottom, you can see two speedometers that show the difference between the displayed and actual speed when changing tires. You can enter other values ​​in the left speedometer using the arrows or directly from the keyboard. Changes will instantly be displayed on the right. By default, the difference is calculated at a speed of 60 kilometers per hour.

If you need to calculate in inches , then simply click on the inscription "Inches" in the switch, which is located under the green button. nine0011

Tire calculator online

To correctly calculate the tire parameters, compare tires, use our very convenient online calculator:

Transfer of tire parameters

/ R

mmmdeum shine mmcmin
Tire profile height: mmcmin
Rim diameter: mmcmin
Tire circumference: mmcminches
RPM:

Comparison of tires

Tire No. 1: / R
Tire No. 2: / R

Tire No. tires:
Ground clearance change:

In the "Tyre #1" fields, enter the standard size for your car. It is usually indicated on a plate pasted in the driver's door opening.

In the "Tire #2" fields, enter the parameters of the tire you want to compare with the reference (tire #1).

The diameter of a new wheel (tire) must not differ by more than 3% from the wheel diameter set by the vehicle manufacturer. nine0011

Tire marking and decryption

Tire width for marking

Tire width ( W Tire ) is indicated by the first number in the marking in millimeters: 225 9033 /50 R16

How to calculate the height of the profile of the profile of the tire profile of the tire profile 9033

is indicated in the tire marking as the second number as a percentage of the first number (tire width): 225/ 50 R16

Thus, to determine it in millimeters, you need to calculate according to the following formula:

Formula

H profile in mm = (W tire ⋅ H profile in % ) / 100

Example

H profile = (205 ⋅ 55) / 100 = 113 mm = 11. 3 cm D or letter not specified): 225/50 R 16 .

This parameter is specified in inches , so if you want to convert it to centimeters, it must be multiplied by 2.54 .

Tire diameter according to the marking

Calculation of the wheel diameter is easy if you know the rim diameter and the profile height of the tire.

Formula

D tire = D disc + 2 ⋅ H profile

0332 205 /55 R16

  1. We determine the height of the profile: H Profile = (205 ⋅ 55) / 100 = 11 ⋅ 2.54 = 40.64 cm
  2. We determine the diameter of the tire: D Tire = 40.64 + 2 ⋅ 11.3 = 63.2 cm

Tire circumference

in order to calculate the length of the tire of the tire C 0333 you need to know its diameter D tires . The calculation is carried out according to the following formula:

Formula

C tire = π ⋅ D Tire , where π π π π π ≈ 3. 14

We take the tire diameter from the previous example D of the tire = 63.2 cm and determine the determination. tire circumference with marking: 205 / 55 R16

С tire = 63.2 ⋅ 3.14 = 198.44 cm

Number of wheel revolutions per 1 km

In order to determine the number of wheel revolutions at which it will overcome a distance of one kilometer, you need to know the outer circumference of the tire.

Formula

The number of revolutions = 100000 / C Tires in cm

Example

For a wheel length with tire circumference 198.44 cm We calculate the number of revolutions for 1 km:

The number of revolutions = 100000 / 198.4 = 503.9 ≈ 504 rev/km

How tire size affects the speedometer reading

If the wheel diameter is larger or smaller than the standard, then the speedometer readings will not reflect the actual speed of the car. So, for example, if the tire diameter is smaller than the standard one, then the speedometer will show the speed more than it actually is.


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