What size is a 325 tire

Tire Size Calculator | Quadratec

Reference

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")

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325/60 R20 vs 325/65 R20 Tire Size Comparison Table with Graphic Visualization (inch difference)

Original tire size
	/	253035404550556065707580859095100	R	121314151617181920212222. 52324

Calculate

135145155165175185195205215225235245255265275285295305315325335345355365375385395	/	253035404550556065707580859095100	R	121314151617181920212222.52324
New tire size

CM INCHES

Parameter	Old	New	Difference
Overall diameter:	-	-	-
Section width	-	-	-
Circumference	-	-	-
Sidewall height	-	-	-
Revs per mile:	-	-	-
Clearance	-
Result:		-

If your speedometer reads:	Real speed is:

Size difference between 325/60 R20 and 325/65 R20 tires.

In the tire comparison table above, you can see a detailed calculation of the size difference between 325/60 R20 and 325/65 R20 tire. The calculation results are presented in the form of visual infographics, on which tire with size 325/60 R20 is on top, and tire with size 325/65 R20 below. Both in the table and in the graph, the tires are compared according to the following indicators: overall diameter, section width, circumference, sidewall height and clearance. Also, the online application calculates the difference in real speed and speedometer readings if the difference between tire 325/60 R20 and tire 325/65 R20 is significant. Calculate the difference in inches.

If you want to compare other tire sizes, then select their sizes in the drop-down fields and click on the green button. The online wheel calculator will then display the new results.

Infographics

Side comparison	Frontal comparison

Tire and wheel matching

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Tire and wheel size charts

Cars
4x4
Commercial vehicles

Passenger cars (table of tire and rim sizes)

Diameter	Size	Rim width
Diameter	Size	Min.	Recommended mend.	Max.
12	125 R12	3.5	3.0	4.0
	135 R12	4.0	3.5	4.5
	145 R12	4.0	3.5	5.0
	155 R12	4.5	4.0	5.0
	145/70 R12	4.5	4.0	5.0
	155/70 R12	4.5	4.0	5.5
13	145/80 R13	3.5	4	5
	145/70 R13	3.5	4.5	5
	145/60 R13	4	4.5	5
	155/80 R13	4	4.5	5
	155/70 R13	4	4. 5	5
	165/80 R13	4	4.5	5
	165/70 R13	4	5	5.5
	165/65 R13	4.5	5	6
	175/70 R13	4.5	5	6
	175/65 R13	5	5	6
	185/70 R13	4.5	5.5	6
14	145/65 R14	4	4.5	5
	155/65 R14	4.5	4.5	5.5
	165/70 R14	4	5	5.5
	165/65 R14	4.5	5	6
	165/60 R14	4.5	5	6
	175/80 R14	4.5	5	6
	175/70 R14	4. 5	5	6
	175/65 R14	5	5	6
	175/60 R14	5	5	6
	185/70 R14	4.5	5.5	6
	185/65 R14	5	5.5	6.5
	185/60 R14	5	5.5	6.5
	185/55 R14	5	6	6.5
	195/70 R14	5	6	6.5
	195/65 R14	5.5	6	7
	195/60 R14	5.5	6	7
15	145/65 R15	4	4.5	5
	155/70 R15	4	4.5	5
	155/65 R15	4.5	4.5	5. 5
	165/65 R15	4.5	5	6
	175/65 R15	5	5	6
	175/60 R15	5	5	6
	175/55 R15	5	5.5	6
	185/65 R15	5	5.5	6.5
	185/60 R15	5	5.5	6.5
	185/55 R15	5	6	6.5
	195/70 R15	5	6	6.5
	195/65 R15	5.5	6	7
	195/60 R15	5.5	6	7
	195/55 R15	5.5	6	7
	195/50 R15	5.5	6	7
	195/45 R15	6	6. 5	7.5
	205/70 R15	5	6	7
	205/65 R15	5.5	6	7.5
	205/60 R15	5.5	6	7.5
	205/55 R15	5.5	6.5	7.5
	205/50 R15	5.5	6.5	7.5
	215/70 R15	5.5	6.5	7
	215/65 R15	6	6.5	7.5
	225/60 R15	6	6.5	8
	225/55 R15	6	7	8
	225/50 R15	6	7	8
16	195/60 R16	5.5	6	7
	195/55 R16	5.5	6	7
	195/50 R16	5. 5	6	7
	195/45 R16	6	6.5	7.5
	205/60 R16	5.5	6	7.5
	205/55 R16	5.5	6.5	7.5
	205/50 R16	5.5	6.5	7.5
	205/45 R16	6.5	7	7.5
	215/65 R16	6	6.5	7.5
	215/60 R16	6	6.5	7.5
	215/55 R16	6	7	7.5
	215/40 R16	7	7.5	8.5
	225/60 R16	6	6.5	8
	225/55 R16	6	7	8
	225/50 R16	6	7	8
	235/60 R16	6. 5	7	8.5
	245/55 R16	7.5	8	9
17	205/55 R17	5.5	6.5	7.5
	205/50 R17	5.5	6.5	7.5
	205/45 R17	6.5	7	7.5
	205/40 R17	7	7.5	8
	215/60 R17	6	6.5	7.5
	215/55 R17	6	7	7.5
	215/50 R17	6	7	7.5
	215/45 R17	7	7	8
	215/40 R17	7	7.5	8.5
	225/60 R17	6	6.5	8
	225/55 R17	6	7	8
	225/50 R17	6	7	8
	225/45 R17	7	7. 5	8.5
	225/35 R17	7.5	8	9
	235/65 R17	6.5	7	8.5
	235/55 R17	6.5	7.5	8.5
	235/50 R17	6.5	7.5	8.5
	235/45 R17	7.5	8	9
	235/40 R17	8	8.5	9.5
	245/55 R17	7	7.5	8.5
	245/45 R17	7.5	8	9
	245/40 R17	8	8.5	9.5
	255/55 R17	7	8	9
	255/45 R17	8	8.5	9.5
	255/40 R17	8.5	9	10
	265/40 R17	9	9. 5	10.5
	275/40 R17	9	9.5	11
	285/40 R17	9.5	10	11
	335/35 R17	11	12	13
18	205/40 R18	7	7.5	8
	215/45 R18	7	7	8
	225/60 R18	6	6.5	8
	225/45 R18	7	7.5	8.5
	225/40 R18	7.5	8	9
	225/35 R18	7.5	8	9
	235/65 R18	6.5	7	8.5
	235/50 R18	6.5	7.5	8.5
	235/45 R18	7.5	8	9
	235/40 R18	8	8. 5	9.5
	245/50 R18	7	7.5	8.5
	245/45 R18	7.5	8	9
	245/40 R18	8	8.5	9.5
	245/35 R18	8	8.5	9.5
	255/45 R18	8	8.5	9.5
	255/40 R18	8.5	9	10
	255/35 R18	8.5	9	10
	265/40 R18	9	9.5	10.5
	265/35 R18	9	9.5	10.5
	275/45 R18	8.5	9	10.5
	275/40 R18	9	9.5	11
	275/35 R18	9	9.5	11
	285/40 R18	9. 5	10	11
	285/35 R18	9.5	10	11
	285/30 R18	10	10	10.5
	295/35 R18	10	10.5	11.5
	295/30 R18	10.5	10.5	11
	315/30 R18	11	11	12.5
	335/30 R18	12	12	12.5
	345/35 R18	11.5	12	13.5
	345/30 R18	12	12	12.5
19	225/40 R19	7.5	8	9
	225/35 R19	7.5	8	9
	235/35 R19	8	8.5	9.5
	245/45 R19	7.5	8	9
	245/40 R19	8	8. 5	9.5
	245/35 R19	8	8.5	9.5
	255/40 R19	8.5	9	10
	255/35 R19	8.5	9	10
	255/30 R19	8.5	9	9.5
	265/35 R19	9	9.5	10.5
	265/30 R19	9	9.5	10
	275/50 R19	7.5	8.5	9.5
	275/40 R19	9	9.5	11
	275/35 R19	9	9.5	11
	275/30 R19	9	9.5	10
	285/35 R19	9.5	10	11
	295/30 R19	10.5	10.5	11
	305/30 R19	11	11	12
	315/25 R19	11	11. 5	12
	325/30 R19	11	11.5	12
	345/30 R19	12	12	12.5
20	235/30 R20		8.5
	245/40 R20	8	8.5	9.5
	245/35 R20	8	8.5	9.5
	245/30 R20	8	8.5	9
	255/35 R20	8.5	9	10
	255/30 R20	8.5	9	9.5
	275/45 R20	8.5	9	10.5
	275/35 R20	9	9.5	11
	285/30 R20	10	10	10.5
	285/25 R20		10.5
	295/25 R20	10. 5	10.5	11
	305/35 R20	10	11	12
	305/25 R20	10.5	11	11.5
	325/25 R20	11.5	12	12.5
	335/30 R20	12	12	12.5
21	245/35 R21	8	8.5	9.5
	255/30 R21	9	9	9.5
	285/30 R21	10	10	10.5
	295/25 R21	10	10.5	11
22	255/30 R22	8.5	9	9.5
22	295/25 R22	10.5	10.5	11

4x4 (Tyre/Rim Size Chart)

Diameter	Size	Rim width
Diameter	Size	Min.	Recommended mend.	Max.
15	185/65 R15	5	5.5	6.5
	195/80 R15	5	5.5	6.5
	195/70 R15	5	6	6.5
	205/70 R15	5	6	7
	215/80 R15	5.5	6	7
	225/75 R15	6	6	7.5
	235/75 R15	6	6.5	8
	255/75 R15	6.5	7	8.5
	265/70 R15	7	8	9
16	205/80 R16	5	5.5	7
	215/70 R16	5. 5	6.5	7
	215/65 R16	6	6.5	7.5
	215/60 R16	6	6.5	7.5
	225/75 R16	6	6	7.5
	225/70 R16	6	6.5	7.5
	235/85 R16	6	6.5	7.5
	235/70 R16	6	7	8
	235/60 R16	6.5	7	8.5
	245/70 R16	6.5	7	8
	255/70 R16	6.5	7.5	8.5
	255/65 R16	7	7.5	9
	265/70 R16	7	8	9
	275/70 R16	7	8	9
17	225/65 R17	6	6. 5	8
	225/55 R17	6	7	8
	235/65 R17	6.5	7	8.5
	235/55 R17	6.5	7.5	8.5
	245/65 R17	7	7	8.5
	255/60 R17	7	7.5	9
	255/50 R17	7	8	9
	265/65 R17	7.5	8	9.5
	265/70 R17	7	8	9
	275/65 R17	7.5	8	9.5
	275/55 R17	7.5	8.5	9.5
18	225/55 R18	6	7	8
	235/60 R18	6.5	7	8.5
	235/50 R18	6. 5	7.5	8.5
	255/60 R18	7	7.5	9
	255/55 R18	7	8	9
	255/45 R18	8	8.5	9.5
	265/60 R18	7.5	8	9.5
	285/50 R18	8	9	10
19	255/55 R19	7	8	9
	255/50 R19	7	8	9
	275/45 R19	8.5	9	10.5
	285/45 R19	9	9.5	10.5
20	255/50 R20	7	8	9
	275/50 R20	7.5	8.5	9.5
	275/40 R20	9	9. 5	11
	295/40 R20	10	10.5	11.5
	315/35 R20	10.5	11	12.5
21	295/35 R21	10	10.5	11.5
22	285/35 R22	9.5	10	11
22	295/30 R22	10	10.5	11
23	315/25 R23	11	11.5	12

Commercial vehicles (tire and rim size chart)

Diameter	Size	Rim width
Diameter	Size	Min.	Recommended mend.	Max.
13	155/80 R13	4	4. 5	5
13	165/70 R13	4.5	5	5
14	165/70 R14	4.5	5	5
	165/75 R14	4	4.5	5
	175/65 R14	5	5	5.5
	175/75 R14	4.5	5	5.5
	185/75 R14	4.5	5	6
	185/80 R14	4.5	5	6
	195/75 R14	5	5.5	6
	195/80 R14	5	5.5	6
	205/75 R14	5	5.5	6.5
15	185/80 R15	4.5	5	6
	195/70 R15	5.5	6	6
	205/65 R15	5. 5	6	6.5
	205/70 R15	5.5	6	6.5
	215/65 R15	6	6.5	7
	215/70 R15	6	6.5	7
	225/70 R15	6	6.5	7
16	6.5/100 R16	4.5	4.5	6
	175/75 R16	4.5	5	5.5
	175/80 R16	4.5	5	5.5
	185/75 R16	4.5	5	6
	195/60 R16	5.5	6	6.5
	195/65 R16	5.5	6	6
	195/75 R16	5	5.5	6
	205/65 R16	5.5	6	6. 5
	205/75 R16	5	5.5	6.5
	215/60 R16	6	6.5	7
	215/65 R16	6	6.5	7
	215/75 R16	5.5	6	7
	225/60 R16	6.5	6.5	7.5
	225/65 R16	6	6.5	7
	225/75 R16	6	6	7
	235/65 R16	6.5	7	7.5

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325/80 R16 vs 315/75 R16 Tire size comparison with graphical visualization

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Your machine size
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R	121314151617181