235/75R15 Tire Size
235/75R15 diameter, sidewall, revolutions per mile, and plus-sizing options.
The 235/75R15 tire size breaks down as: 235 mm section width, 75% aspect ratio, and a 15-inch rim. Below are its real, calculated dimensions.
235/75R15 Calculated Dimensions
| Metric | Value |
|---|---|
| Overall diameter | 28.9 in (733 mm) |
| Sidewall height | 6.9 in (176 mm) |
| Circumference | 90.7 in (2304 mm) |
| Revolutions per mile | 698 |
Typical Fitment
235/75R15 is most often found on older SUVs and pickups. Always confirm against the door-jamb placard or owner manual before fitting.
Plus-Sizing Alternatives
These sizes keep the overall diameter close to 235/75R15, so speedometer and gearing stay near stock:
| Size | Diameter | Diameter change |
|---|---|---|
| 245/70R15 | 28.50 in | -1.3% |
| 245/65R16 | 28.54 in | -1.2% |
| 255/60R17 | 29.05 in | +0.6% |
Speedometer Note
If you fit a 245/70R15 instead of 235/75R15, the diameter changes by -1.3%. A taller tire makes your speedometer read low — at a true 60 mph it would show roughly 61 mph. A shorter tire has the opposite effect, so the gauge reads high.
Use the tire calculator to compare 235/75R15 against any other size and see the exact diameter and speedometer difference.
Frequently Asked Questions
What does 235/75R15 mean?
235/75R15 means a 235 mm wide tire with a 75% sidewall aspect ratio mounted on a 15-inch rim. The aspect ratio is the sidewall height as a percentage of the width.
Can I plus-size from 235/75R15?
Yes, as long as the replacement keeps the overall diameter close to stock so the speedometer stays accurate. Common plus-size moves from 235/75R15 are 245/70R15, 245/65R16, 255/60R17.
Will 235/75R15 affect my speedometer?
Only if it differs in diameter from your original size. A taller tire reads low; a shorter tire reads high. Compare the two sizes with the calculator to find the percentage.