Tire size 255 in inches

Tire Size Calculator | Quadratec

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Jen
March 23, 2017

How to Understand Your Current Tire Size

Knowing your Jeep's tire size can be essential information when it comes time to replace that rubber, or even if you ever decide to change wheels. And while a stock tire size is imprinted right inside the driver side B pillar, you may not know what if have if you are not the original owner.

So here is some helpful information to assist you in determining what you currently have on the vehicle.

First, the sidewall of your tire contains all the information needed to understand everything about that specific tire. All tires are required to have this information, regardless of the manufacturer brand name.

Now, this information could read in a few different ways. For example, it could simply say 35x12.5 R17, or it may show as P265 75 R15. If it is the first listing, then here is the breakdown. That first number is your tire size at 35", and then the second number tells you the tire width at 12. 5". That third reading is the tire type as radial and diameter as 17".

The second listing is a metric set up, and is what is more common on factory-type sized tires. From left to right, the P indicates a passenger tire while 265 indicates the tires width in millimeters. That 75 is the tire's aspect ratio and simply means the tire's height is equal to 75 percent of its width. Finally, like the first set of numbers, that R15 means it is a radial tire and has a 15" diameter.

For those who have the metric reading on their tires, you can simply plug that into the conversion calculator to determine the tire size, or find that corresponding reading on one of the below conversion charts.

Metric to Standard Conversion

Enter the metric size (i.e. 285/75 R17)

15-inch Wheel Conversion Chart

Metric to Standard Tire Conversion Chart for 15 inch Wheels
Metric	Standard
215/75/15	27. 7"x 8.5"
225/70/15	27.4"x 8.9"
225/75/15	28.3"x 8.9"
235/75/15	29.0"x 9.3"
245/75/15	29.5"x 9.6"
255/75/15	30.0"x 10.0"
265/75/15	30.6"x 10.4"

16-inch Wheel Conversion Chart

Metric to Standard Tire Conversion Chart for 16 inch Wheels
Metric	Standard
205/85/16	29.7"x 8.1"
215/75/16	28.7"x 8.5"
225/70/16	28.4"x 8.9"
225/75/16	29.2"x 8.9"
235/70/16	29.0"x 9.3"
235/85/16	31.7"x 9.3"
245/70/16	29.5"x 9.6"
245/75/16	30.5"x 9.6"
255/70/16	30.0"x 10.0"
265/70/16	30. 6"x 10.4"
265/75/16	31.6"x 10.4"
275/70/16	31.2"x 10.8"
285/75/16	32.8"x 11.2"
295/75/16	33.4"x 11.6"
305/70/16	33.0"x 12.2"
315/75/16	34.8"x 12.4"
375/55/16	32.8"x 15.5"
395/70/16	37.9"x 16.0"

17-inch Wheel Conversion Chart

Metric to Standard Tire Conversion Chart for 17 inch Wheels
Metric	Standard
245/70/17	30.6"x 9.8
265/70/17	31.6"x 10.7
285/70/17	33.0"x 11.5
315/70/17	34.4"x 12.4

18-inch Wheel Conversion Chart

Metric to Standard Tire Conversion Chart for 18 inch Wheels
Metric	Standard
275/65/18	32. 1"x 11.0
375/50/18	33.0"x 15.4
325/60/18	33.2"x 13.3
325/65/18	34.8"x 13.5
305/70/18	35.0"x 12.2
375/60/18	35.7"x 15.5
395/65/18	37.8"x 15.7

20-inch Wheel Conversion Chart

Metric to Standard Tire Conversion Chart for 20 inch Wheels
Metric	Standard
325/50/20	33.0"x 13.2"

Metric measurement example: 225/70R15

225 = Section width in millimeters

70 = Aspect ratio (ratio of section height to section width)

R15 = Rim diameter

R = Radial Construction, B = Bias Construction, D = Bias Belted Construction

Calculations for Measurements

Tire Width: Section width divided by 25.4 (Ex: 225 / 25.4 = 8.86")

Section Height: Tire width times aspect ratio (Ex: 8. 86" x 70% = 6.20")

Overall Diameter: Section height times 2 plus rim diameter (Ex: (6.20" x 2) + 15 = 27.40")

See all tires here

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How To Put Bigger Tires On Your Jeep

If you have your eye on some larger tires for your vehicle, here is what you need to know.

Helpful Tire Info - BUDNIK

Our chart shows the overall section width, the outside diameter, the sidewall height and the recommended rim width range.

If your car requires something unique, start with picking the tire for the end of the car that is the most difficult.

If you’ve mini-tubbed the rear for example, and are going to run a big tire with less brand/tread/size choices, start by figuring out that size and what your options are. Then see if the those tire manufacturers also make a matching tire for your front.

We’ve included the sidewall height of the tire as a quick way to make sure your front tire doesn’t have a taller sidewall than your rear tire when doing staggered sizes. That’s usually not a good look.

There is a recommended rim width range for any given tire size with the ideal width usually around the middle of that spread. Some things to consider are how much sidewall bulge you want to see and most importantly, how wheel width affects the tires ride, handling and wear characteristics.

For grip and even wear the wheel width needs to allow for a good contact patch where the tread meets the pavement.

A wider wheel tends to make the tire more responsive to steering inputs but also taken to extremes can make the ride harsh because the sidewall doesn’t flex as easily.

A narrower wheel can give up some of that responsive handling and will tend to give a softer ride because the sidewall has more curve that flexes more easily.

Budnik Tire Chart


SIZE	Overall Diameter	Overall (section) Width	Sidewall Height	Approx Rim Widths	Nitto Tires
205/40-17	23.5	8.1	3.3	7.0-7.5	NT01
205/45-17	24.3	8.1	3.6	7
205/50-17	25.1	8.1	4	7
215/35-17	22. 9	8.5	3	7.0-8.5
215/40-17	23.8	8.5	3.4	7.0-8.5
215/45-17	24.7	8.5	3.8	7.0-8.0
225/35-17	23.2	8.9	3.1	7.5-9.0
225/40-17	24.1	8.9	3.5	7.5-9.0
225/45-17	25	8.9	4	7.0-8.5
225/50-17	25.9	8.9	4.4	6.0-8.0
235/40-17	24.4	9.3	3.7	8.0-9.5	NT05,NT01
235/45-17	25.3	9.3	4.2	7.5-9.0	NT555, INVO
235/50-17	26.3	9.3	4.6	6.5-8.5
245/35-17	23.8	9.6	3.4	8.0-9.5
245/40-17	24. 7	9.6	3.9	8.0-9.5	INVO
245/45-17	25.7	9.6	4.3	7.5-9.0	INVO, NT01
245/50-17	26.7	9.6	4.9	7.0-8.5
255/40-17	25	10	4	8.5-10.0	NT05,NT555,NT01
255/45-17	26	10	4.5	8.0-9.5
265/40-17	25.3	10.4	4.2	9.0-10.0
275/40-17	25.7	10.8	4.4	9.0-11.0
275/50-17	27.8	10.8	5.4	7.5-9.5
285/40-17	26	11.2	4.5	9.5-11.0	NT555
315/35-17	25.7	12.4	4.3	11.0-12.0	NT05,NT555,NT01

18″	Overall Diameter	Overall (section) Width	Sidewall Height	Approx Rim Widths
205/40-18	24. 5	8.1	3.2	7.0-8.0
215/35-18	23.9	8.5	3	7.0-8.5
215/40-18	24.8	8.5	3.4	7.0-8.5
215/45-18	25.6	8.5	3.8	7.0-8.0
225/35-18	24.2	8.9	3.1	7.5-9.0
225/40-18	25.1	8.9	3.6	7.5-9.0	NT05,NT555,NT01
225/45-18	26	8.9	4	7.0-8.5	NT555, INVO
235/35-18	24.5	9.3	3.2	9.0-9.5
235/40-18	25.4	9.3	3.7	8.0-9.5	NT05, NT555, NT01
235/45-18	26.3	9.3	4.2	7.5-9.0
245/35-18	24.8	9.6	3.4	8.0-9.5
245/40-18	25. 7	9.6	3.9	8.0-9.5	NT05,NT555,INVO,NT01
245/45-18	26.7	9.6	4.4	7.5-9.0	NT555, INVO
245/50-18	27.6	9.6	4.8	7.0-8.5
255/35-18	25	10	3.5	8.5-10.0	NT05, NT555
255/40-18	26	10	4	8.5-10.0
255/45-18	27	10	4.5	8.0-9.5
265/35-18	25.3	10.4	3.7	9.0-10.0	NT05, NT555, INVO
265/40-18	26.3	10.4	4.2	9.0-10.0
275/35-18	26.7	10.8	3.8	9.0-11.0	NT555, INVO,NT01
275/45-18	26.7	10.8	4.9	8.5-10.5
285/35-18	25.9	11.2	3.9	9. 5-11.0	NT05, NT555
295/35-18	26.1	11.6	4.1	10.0-12.0	NT05. INVO
315/30-18	25.4	12.4	3.7	11.0-12.0	NT05,NT01
335/30-18	25.9	13.2	4	12.0-13.0
345/30-18	26.1	13.6	4.1	12.0-14.0

19″	Overall Diameter	Overall (section) Width	Sidewall Height	Approx Rim Widths
225/40-19	26.1	8.9	3.5	7.0-9.0	NT05, INVO
235/35-19	25.5	9.3	3.2	8.0-9.5	NT05, NT555,NT01
235/40-19	26.4	9.3	3.7	8.0-9.5
245/35-19	25.8	9.6	3.4	8.0-9.5	NT05, NT555, INVO
245/40-19	26. 7	9.6	3.9	8.0-9.5	NT05, INVO
245/45-19	27.7	9.6	4.3	7.5-9.0
255/30-19	25	10	3	8.5-9.5	INVO
255/35-19	26	10	3.5	8.5-10.0	INVO
255/40-19	27	10	4	8.5-10.0	NT05, INVO
265/35-19	26.3	10.4	3.7	9.0-10.5
275/35-19	26.6	10.8	3.8	9.0-11.0	INVO
275/40-19	27.7	10.8	4.3	9.0-11.0
285/30-19	25.7	11.2	3.4	9.5-10.5	INVO
285/35-19	26.9	11.2	3.9	9.5-11.0	INVO
285/40-19	28	11.2	4.5	9.5-11.0
295/35-19	27. 1	11.6	4.1	10.0-12.0	INVO
305/30-19	26.2	12	3.6	10.5-11.5	NT05,NT01
305/35-19	27.4	12	4.2	10.5-11.5
315/40-19	28.9	12.4	5	11.0-12.0	INVO
325/30-19	26.7	12.8	3.8	12.0-13.0	INVO
345/30-19	27.1	13.6	4.1	12.0-14.0	INVO
345/35-19	28.5	13.6	4.8	11.0-13.5

20″	Overall Diameter	Overall (section) Width	Sidewall Height	Approx Rim Widths
225/35-20	26.2	8.9	3.1	7.5-9.0	NT555
235/30-20	25.6	9.3	2.8	8. 5	INVO
235/35-20	26.5	9.3	3.2	8.0-9.5
235/45-20	28.3	9.3	4.2	7.5-9.0
235/55-20	30.2	9.3	5.1	6.5-8.5
245/30-20	25.8	9.6	2.9	8.0-9.0	NT555, INVO
245/35-20	26.8	9.6	3.4	8.0-9.5	NT555, INVO
245/40-20	27.7	9.6	3.9	8.0-9.5	NT555, INVO
245/45-20	28.7	9.6	4.3	7.5-9.0	INVO
245/50-20	29.6	9.6	4.8	7.0-8.5
255/30-20	26	10	3	8.5-9.5	INVO
255/35-20	27	10	3.5	8.5-10	NT05, NT555, INVO
255/40-20	28	10	4	8. 5-10	NT01
255/45-20	29	10	4.5	8.0-9.5	NT05, INVO
255/50-20	30	10	5	7.0-9.0
255/55-20	31	10	5.5	7.0-9.0
265/30-20	26.3	10.4	3.1	9.0-10.0
265/35-20	27.3	10.4	3.7	9-10.5	NT555
265/40-20	28.3	10.4	4.2	9.0-10.5
265/45-20	29.4	10.4	4.7	8.5-10.0
275/30-20	26.5	10.8	3.2	9.0-10.0	NT555, INVO
275/35-20	27.6	10.8	3.9	9.0-11.0	NT05, NT555, INVO
275/40-20	28.7	10.8	4.3	9.0-11.0	INVO
275/45-20	29.7	10. 8	4.9	8.5-10.0
285/30-20	26.7	11.2	3.4	9.5-10.5	NT555, INVO
285/35-20	27.9	11.2	3.9	9.5-11.0	NT01
285/40-20	29	11.2	4.5	9.5-11.0
285/45-20	30.1	11.2	5	9.0-10.5
295/30-20	27	11.6	3.5	10.0-11.0
295/35-20	28.1	11.6	4.1	10.0-11.5	INVO
295/40-20	29.3	11.6	4.6	10.0-12.0
295/45-20	30.5	11.6	5.2	9.5-11.0
295/50-20	31.6	11.6	5.8	8.0-10.5
305/35-20	28.4	12	4.2	10.0-12.0
305/40-20	29. 6	12	4.8	10.0-12.0
315/35-20	28.7	12.4	4.3	10.5-12.5	NT05, INVO
335/25-20	26.6	13.2	4	12.0-13.00
335/30-20	27.9	13.2	4	11.5-12.5
345/25-20	26.8	13.6	3.4	12.0-13.0	INVO

LT TRUCK	Overall Diameter	Overall (section) Width	Sidewall Height	Approx Rim Widths
265/60-20	32.5	10.4	6.3	7.5-9.5	TERRA
275/60-20	33	10.8	6.5	7.5-9.5	TERRA
285/55-60	32.3	11.2	6.2	8.0-10.0	TERRA
285/60-20	33.5	11.2	6.7	8. 0-10.0
305/55-20	33.2	12	6.6	8.5-11.0	TERRA

22″	Overall Diameter	Overall (section) Width	Sidewall Height	Approx Rim Widths
235/30-22	27.6	9.3	2.8	8.5
245/30-22	27.8	9.6	2.9	8.0-9.0	NT555, INVO
255/30-22	28	10	3	8.0-8.5	NT555, INVO
255/35-22	29	10	3.5	8.5-10	INVO
265/30-22	28.3	10.4	3.1	9.0-10.0	INVO
265/35-22	29.3	10.4	3.7	9.0-10.5	420S
265/40-22	30.3	10.4	4.2	9.0-10.5	420S, NT555
265/45-22	31. 4	10.4	4.7	8.5-10.0
275/30-22	28.5	10.8	3.2	9.0-10.0	INVO
275/40-22	30.7	10.8	4.3	9.0-11.0	420S
275/45-22	31.7	10.8	4.9	8.5-10.0	420S
285/30-22	28.7	11.2	3.4	9.5-10.5	INVO
285/35-22	29.9	11.2	3.9	9.5-11.0	420S, NT555
285/40-22	31	11.2	4.5	9.5-11.0	420S
285/45-22	32.1	11.2	5	9.0-11.0
295/30-22	29	11.6	3.5	10.0-11.0
295/45-22	32.5	11.6	5.2	9.5-11.0
305/35-22	30.4	12	4.2	10.5-11.5
305/40-22	31. 6	12	4.8	10.0-12.0
305/45-22	32.8	12	5.4	9.0-1.0
315/25-22	28.2	12.4	3.1	11.0-12.0
335/25-22	28.5	10.8	3.2	11.5-12.5
335/30-22	28.7	13.7	3.3	12.0-13.0

255/55 R18 vs 245/60 R18 Tire size comparison with graphical visualization (difference in inches)

Your machine size
	/	253035404550556065707580859095100	R	121314151617181920212222.52324

Calculate

135145155165175185195205215225235245255265275285295305315325335345355365375385395	/	253035404550556065707580859095100	R	121314151617181920212222. 52324
nine0008 New tire size

CM INCHES

nine0004 - nine0011

Index	Old	New	Difference
Diameter	-	-	-
Width	-	-
Circumference	-	-	-
Profile height	-	-	-
RPM	-	-	-
Clearance change	-
Result:		-

With speedometer:	Real speed will be:

Comparison of tire sizes 255/55 R18 and 245/60 R18.

In the table above you can see a detailed comparison of the difference in dimensions, parameters and performance between a 255/55 R18 tire and a 245/60 R18 tire. The results of the calculations are also presented in the form of visual models (infographics), on which the tire with a size of 255/55 R18 is on top, and with a size of 245/60 R18, respectively, at the bottom. The visualization was generated in two projections: lateral (left) and frontal (right). The online calculator compares tires according to the following characteristics: diameter, width, circumference, profile height, revolutions per km, ground clearance change. In addition, a potential deviation between the actual speed and the speed displayed on the speedometer is calculated, which can occur if the difference between tires 255/55 R18 and 245/60 R18 is significant. US and UK inch version of calculations. nine0009

If you want to compare other tyres, just select the required parameters in the drop-down fields and click on the green button.

Infographic

Side Comparison	Frontal comparison

255/55 R20 vs 255/50 R20 Tire size comparison with graphical visualization (difference in inches)

Your machine size
	/	253035404550556065707580859095100	R	121314151617181920212222.52324