235/75R15 tire size in inches and millimeters
235/75R15 measures 28.88 inches in overall diameter, 9.25 inches in section width, with a 6.94 inch sidewall.
Every dimension
| Size | In inches | In millimetres |
|---|---|---|
| Overall diameter | 28.88 in | 733.5 mm |
| Section width | 9.25 in | 235 mm |
| Sidewall height | 6.94 in | 176.2 mm |
| Circumference | 90.72 in | 2,304.4 mm |
| Revolutions per mile | 698.4 per mile | 434.0 per km |
Sizes that fit the same wheel
These sizes share a 15 inch wheel diameter and sit within 3% of 235/75R15 in overall diameter, which is the range a swap stays inside without recalibrating anything.
The percentage difference in overall diameter is the speedometer error: a tire 2% taller makes an indicated 60 mph a true 61.2 mph. They are the same number, so it is shown once.
| Alternate size | Overall diameter | Difference (in) | Difference (%) | Width difference (in) |
|---|---|---|---|---|
| 295/60R15 | 28.94 | 0.06 | 0.20 | 2.36 |
| 355/50R15 | 28.98 | 0.10 | 0.34 | 4.72 |
| 205/85R15 | 28.72 | -0.16 | -0.55 | -1.18 |
| 255/70R15 | 29.06 | 0.18 | 0.61 | 0.79 |
| 275/65R15 | 29.07 | 0.20 | 0.68 | 1.57 |
| 325/55R15 | 29.07 | 0.20 | 0.68 | 3.54 |
| 315/55R15 | 28.64 | -0.24 | -0.82 | 3.15 |
| 225/80R15 | 29.17 | 0.30 | 1.02 | -0.39 |
| 345/50R15 | 28.58 | -0.30 | -1.02 | 4.33 |
| 265/65R15 | 28.56 | -0.32 | -1.09 | 1.18 |
| 215/80R15 | 28.54 | -0.33 | -1.16 | -0.79 |
| 245/70R15 | 28.50 | -0.37 | -1.30 | 0.39 |
| 285/60R15 | 28.46 | -0.41 | -1.43 | 1.97 |
| 215/85R15 | 29.39 | 0.51 | 1.77 | -0.79 |
| 305/60R15 | 29.41 | 0.53 | 1.84 | 2.76 |
| 225/75R15 | 28.29 | -0.59 | -2.04 | -0.39 |
| 245/75R15 | 29.47 | 0.59 | 2.04 | 0.39 |
| 335/55R15 | 29.51 | 0.63 | 2.18 | 3.94 |
| 305/55R15 | 28.21 | -0.67 | -2.32 | 2.76 |
| 335/50R15 | 28.19 | -0.69 | -2.39 | 3.94 |
| 285/65R15 | 29.59 | 0.71 | 2.45 | 1.97 |
| 265/70R15 | 29.61 | 0.73 | 2.52 | 1.18 |
| 195/85R15 | 28.05 | -0.83 | -2.86 | -1.57 |
| 255/65R15 | 28.05 | -0.83 | -2.86 | 0.79 |
How this is worked out
sidewall height in millimetres = section width × aspect ratio ÷ 100
overall diameter in inches = wheel diameter + (section width × aspect ratio × 2) ÷ 2540
section width in inches = section width in millimetres ÷ 25.4
circumference in inches = π × overall diameter
revolutions per mile = 63360 ÷ circumference in inches
The divisor is 2540, not the 2550 some converters publish. Two sidewalls in inches are 2 × width × aspect ÷ (100 × 25.4), and the rounding costs about 0.07 inches at 34 inches.
For 235/75R15: the sidewall is 176.2 millimetres, two of them are 13.88 inches, and adding the 15 inch wheel gives 28.88 inches overall.
Questions
What size is 235/75R15 in inches?
28.88 inches in overall diameter, 9.25 inches in section width, with a 6.94 inch sidewall.
How tall is a 235/75R15 tire?
28.88 inches, which is 733.5 millimetres.
What do the numbers in 235/75R15 mean?
235 is the section width in millimetres, 75 is the sidewall height as a percentage of that width, and 15 is the wheel diameter in inches. Overall diameter is the wheel diameter plus two sidewalls: 28.88 inches.
Does 235/75R15 fit a 15-inch wheel?
Yes — the 15 in a metric tire size *is* the wheel diameter, so 235/75R15 is made for a 15 inch wheel. Rim width is a separate question the sidewall code does not answer.
What tire sizes are equivalent to 235/75R15?
295/60R15, 355/50R15, 205/85R15 are the closest by overall diameter, all on the same 15 inch wheel.
Fitting a size is not only a matter of diameter. Rim width, load rating, speed rating and clearance all decide whether a size works on a given vehicle, and none of them can be read off the sidewall code alone.