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235/75R15 in Inches: Tire Diameter, Width and Sidewall
A 235/75R15 tire is 28.9 inches (733 mm) tall and 9.3 inches (235 mm) wide, with a 6.9-inch sidewall, for a 15-inch rim. It turns 698 times per mile.
Example: 235/75R15. Also accepts 275/55-20 or 275 55 20.
| Measure | Inches | Millimetres |
|---|---|---|
| Overall diameter | 28.9 in | 733 mm |
| Section width | 9.3 in | 235 mm |
| Sidewall height | 6.9 in | 176 mm |
| Circumference | 90.7 in | 2304 mm |
| Rim diameter | 15 in | 381 mm |
| Revolutions per mile | 698 | |
| Revolutions per km | 434 |
Nominal size from the size code; real tires vary by brand, rim width and inflation. Fit on your vehicle is not checked.
235/75R15 tire size explained
The code 235/75R15 describes the tire in three numbers. The 235 is the section width in millimetres, which is 9.3 inches. The 75 is the aspect ratio, so the sidewall is 75% of 235 mm, or 176 mm (6.9 in). The 15 is the wheel diameter in inches (381 mm).
Add the rim and two sidewalls together and the tire stands 28.9 inches high. One full turn of the wheel carries the vehicle 90.7 inches (2.30 m), which is why a 235/75R15 makes about 698 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 235/75R15 next to the size you have now.
Sizes close to 235/75R15
These common sizes are within 3% of the 28.9-inch diameter of the 235/75R15. A small difference keeps the speedometer near right, but width, load rating and fit can still differ, so check each one.
| Size | Diameter | vs 235/75R15 | Width | Tool |
|---|---|---|---|---|
| 235/70R16 | 29.0 in | +0.3% | 9.3 in (235 mm) | Compare |
| 235/65R17 | 29.0 in | +0.5% | 9.3 in (235 mm) | Compare |
| 255/55R18 | 29.0 in | +0.6% | 10.0 in (255 mm) | Compare |
| 235/60R18 | 29.1 in | +0.8% | 9.3 in (235 mm) | Compare |
| 225/65R17 | 28.5 in | -1.3% | 8.9 in (225 mm) | Compare |
| 245/65R17 | 29.5 in | +2.3% | 9.6 in (245 mm) | Compare |
| 245/50R20 | 29.6 in | +2.7% | 9.6 in (245 mm) | Compare |
Changing to or from 235/75R15
If you move from 235/70R16 to 235/75R15, the overall diameter changes by -0.3% and the speedometer reads accordingly. The speedometer correction is the new diameter divided by the old one, so with a diameter 28.9 in the actual speed is the displayed speed multiplied by 28.9 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 235 mm tire.
- Check clearance at full steering lock and over bumps; this is a common place where a larger tire rubs.
235/75R15 FAQ
How many inches is a 235/75R15 tire?
A 235/75R15 tire is about 28.9 inches (733 mm) tall overall, 9.3 inches (235 mm) wide, and has a sidewall of 6.9 inches (176 mm).
What does 235/75R15 mean?
235 is the section width in millimetres, 75 means the sidewall is 75% of the width, R means radial construction and 15 is the rim diameter in inches.
How many revolutions per mile does a 235/75R15 make?
About 698 revolutions per mile (434 per kilometre), based on a circumference of 90.7 inches.
Will a 235/75R15 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.