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265/70R17 in Inches: Tire Diameter, Width and Sidewall
A 265/70R17 tire is 31.6 inches (803 mm) tall and 10.4 inches (265 mm) wide, with a 7.3-inch sidewall, for a 17-inch rim. It turns 638 times per mile.
Example: 265/70R17. Also accepts 275/55-20 or 275 55 20.
| Measure | Inches | Millimetres |
|---|---|---|
| Overall diameter | 31.6 in | 803 mm |
| Section width | 10.4 in | 265 mm |
| Sidewall height | 7.3 in | 186 mm |
| Circumference | 99.3 in | 2522 mm |
| Rim diameter | 17 in | 432 mm |
| Revolutions per mile | 638 | |
| Revolutions per km | 396 |
Nominal size from the size code; real tires vary by brand, rim width and inflation. Fit on your vehicle is not checked.
265/70R17 tire size explained
The code 265/70R17 describes the tire in three numbers. The 265 is the section width in millimetres, which is 10.4 inches. The 70 is the aspect ratio, so the sidewall is 70% of 265 mm, or 186 mm (7.3 in). The 17 is the wheel diameter in inches (432 mm).
Add the rim and two sidewalls together and the tire stands 31.6 inches high. One full turn of the wheel carries the vehicle 99.3 inches (2.52 m), which is why a 265/70R17 makes about 638 turns in a mile. Speedometers, odometers and traction systems are set up for a particular size, so changing to a tire with a different diameter changes what they read.
New to size codes? See how to read a tire size, or use the tire size comparison calculator to put 265/70R17 next to the size you have now.
Sizes close to 265/70R17
These common sizes are within 3% of the 31.6-inch diameter of the 265/70R17. A small difference keeps the speedometer near right, but width, load rating and fit can still differ, so check each one.
| Size | Diameter | vs 265/70R17 | Width | Tool |
|---|---|---|---|---|
| 265/75R16 | 31.6 in | +0.1% | 10.4 in (265 mm) | Compare |
| 275/55R20 | 31.9 in | +1.0% | 10.8 in (275 mm) | Compare |
| 255/70R18 | 32.1 in | +1.4% | 10.0 in (255 mm) | Compare |
| 255/75R17 | 32.1 in | +1.4% | 10.0 in (255 mm) | Compare |
| 275/65R18 | 32.1 in | +1.5% | 10.8 in (275 mm) | Compare |
| 285/45R22 | 32.1 in | +1.6% | 11.2 in (285 mm) | Compare |
| 255/55R20 | 31.0 in | -1.8% | 10.0 in (255 mm) | Compare |
| 285/55R20 | 32.3 in | +2.3% | 11.2 in (285 mm) | Compare |
Changing to or from 265/70R17
If you move from 265/75R16 to 265/70R17, the overall diameter changes by -0.1% and the speedometer reads accordingly. The speedometer correction is the new diameter divided by the old one, so with a diameter 31.6 in the actual speed is the displayed speed multiplied by 31.6 and divided by the old diameter. The odometer follows the same ratio.
- Check the door-jamb placard for the size your vehicle was built for.
- Confirm the load index and speed rating are at least what the placard asks for.
- Ask whether your wheel width suits a 265 mm tire.
- Check clearance at full steering lock and over bumps; this is a common place where a larger tire rubs.
265/70R17 FAQ
How many inches is a 265/70R17 tire?
A 265/70R17 tire is about 31.6 inches (803 mm) tall overall, 10.4 inches (265 mm) wide, and has a sidewall of 7.3 inches (186 mm).
What does 265/70R17 mean?
265 is the section width in millimetres, 70 means the sidewall is 70% of the width, R means radial construction and 17 is the rim diameter in inches.
How many revolutions per mile does a 265/70R17 make?
About 638 revolutions per mile (396 per kilometre), based on a circumference of 99.3 inches.
Will a 265/70R17 tire fit my vehicle?
The size code alone cannot tell. Fit depends on your wheel width and offset, suspension and fender clearance. Check your door-jamb placard for the approved sizes and ask a tire shop.