235/75R16 vs 30x9.50R15
30x9.50R15 is a safe swap for 235/75R16 by the usual ±3% rule: the diameter differs by +0.41%.
Side by side
| 235/75R16 | 30x9.50R15 | Difference | |
|---|---|---|---|
| Overall diameter | 29.88" | 30.00" | +0.12" (+0.41%) |
| Section width | 235 mm | 241 mm | +6 mm |
| Sidewall | 6.94" | 7.50" | +0.56" |
| Rim | 16" | 15" | -1" |
| Circumference | 93.9" | 94.2" | +0.4" |
| Revs per mile | 675 | 672 | -3 |
| Ride height | — | — | +0.06" |
| Speedometer reads 60 mph | 60.0 | 60.2 | +0.2 mph |
Speedometer and odometer
With 30x9.50R15 on a car calibrated for 235/75R16, the speedometer reads 59.8 mph when you're really doing 60, and the odometer under-counts by 0.4%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.1 mph |
| 45 mph | 45.2 mph |
| 60 mph | 60.2 mph |
| 70 mph | 70.3 mph |
| 80 mph | 80.3 mph |
Other sizes close to 235/75R16
- 235/75R16 vs 245/75R16+1.98%
- 235/75R16 vs 225/75R16-1.98%
- 235/75R16 vs 265/70R16+2.44%
- 235/75R16 vs 235/70R16-3.10%
- 235/75R16 vs 245/70R16-1.25%
- 235/75R16 vs 255/65R17+0.58%
- 235/75R16 vs 225/70R16-4.94%
- 235/75R16 vs 255/70R16+0.59%
- 235/75R16 vs 215/85R16+1.71%
- 235/75R16 vs 235/70R17+0.25%
- 235/75R16 vs 255/65R16-2.77%
- 235/75R16 vs 275/70R16+4.28%
Questions
Can I replace 235/75R16 with 30x9.50R15?
30x9.50R15 is a safe swap for 235/75R16 by the usual ±3% rule: the diameter differs by +0.41%.
What's the difference between 235/75R16 and 30x9.50R15?
30x9.50R15 is 0.12" taller and 6 mm wider; the sidewall is +0.56". At an indicated 60 mph you'd actually be doing 60.2 mph.
Will 30x9.50R15 fit on 235/75R16 wheels?
No — 235/75R16 needs a 16" wheel and 30x9.50R15 a 15" wheel. This is a plus/minus-size swap that changes wheels too.