Tire Size Meaning and Size in Inches

In 265/70R17, 265 is the width in millimeters, 70 is the sidewall height as a percentage of width, R is radial, and 17 is the wheel diameter in inches — about 31.6 inches tall overall. Below: widths in inches, 36 factory sizes worked out, and factory tire sizes for 12 vehicles.

Source: manufacturer documents (listed below) · Updated 2026-11-05 · By CarWhere Research

265
Width, mm
10.43 in
70
Aspect ratio, %
7.3 in sidewall
R
Construction
Radial
17
Wheel diameter, in
31.6 in overall

Factory tire size by vehicle

Tire width in inches

Tire section width in millimeters and inches
WidthInches
155 mm6.1 in
165 mm6.5 in
175 mm6.89 in
185 mm7.28 in
195 mm7.68 in
205 mm8.07 in
215 mm8.46 in
225 mm8.86 in
235 mm9.25 in
245 mm9.65 in
255 mm10.04 in
265 mm10.43 in
275 mm10.83 in
285 mm11.22 in
295 mm11.61 in
305 mm12.01 in
315 mm12.4 in
325 mm12.8 in
335 mm13.19 in

Factory sizes in inches

Check the exact vehicle, not just the model

Trim, package and production changes all move these numbers. Decode the 17-character VIN with the free VIN decoder to confirm the engine and trim, or see the federal engine and MPG specs. Shopping? Browse live inventory and what buyers actually paid.

Frequently asked questions

How do I read a tire size?

Take 265/70R17: 265 is the section width in millimeters, 70 is the aspect ratio (sidewall height as a percentage of width), R means radial construction, and 17 is the wheel diameter in inches. A P or LT in front marks a passenger or light-truck tire.

How do I convert a tire size to inches?

Width in inches = width in mm ÷ 25.4. Sidewall = width × aspect ÷ 100, then ÷ 25.4. Overall diameter = wheel size + 2 × sidewall. For 265/70R17: 10.43 in wide, 7.3 in sidewall, about 31.6 in tall.

Where do I find my car's tire size?

On the tire sidewall, and on the tire and loading information placard on the driver's door jamb, which lists the factory size and recommended cold pressures. The owner's manual lists it too.

What do the numbers after the size mean, like 113T?

That is the service description: a load index (113 is a maximum load per tire from a standard table) and a speed rating letter (T is rated to 118 mph). Replacements should meet or exceed both.

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