33x12.50R17 vs 315/70R17
315/70R17 is outside the ±3% rule as a replacement for 33x12.50R17: the diameter differs by +4.13%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Side by side
| 33x12.50R17 | 315/70R17 | Difference | |
|---|---|---|---|
| Overall diameter | 33.00" | 34.36" | +1.36" (+4.13%) |
| Section width | 318 mm | 315 mm | -3 mm |
| Sidewall | 8.00" | 8.68" | +0.68" |
| Rim | 17" | 17" | same |
| Circumference | 103.7" | 108.0" | +4.3" |
| Revs per mile | 611 | 587 | -24 |
| Ride height | — | — | +0.68" |
| Speedometer reads 60 mph | 60.0 | 62.5 | +2.5 mph |
Speedometer and odometer
With 315/70R17 on a car calibrated for 33x12.50R17, the speedometer reads 57.6 mph when you're really doing 60, and the odometer under-counts by 4.1%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.2 mph |
| 45 mph | 46.9 mph |
| 60 mph | 62.5 mph |
| 70 mph | 72.9 mph |
| 80 mph | 83.3 mph |
Other sizes close to 33x12.50R17
- 33x12.50R17 vs 265/70R17-4.22%
- 33x12.50R17 vs 275/70R18+0.48%
- 33x12.50R17 vs 285/70R17-0.88%
- 33x12.50R17 vs 245/75R17-4.64%
- 33x12.50R17 vs 235/80R17-3.63%
- 33x12.50R17 vs 285/75R16-0.51%
- 33x12.50R17 vs 255/75R17-2.85%
- 33x12.50R17 vs 295/70R17+0.79%
- 33x12.50R17 vs 33x12.50R180.00%
- 33x12.50R17 vs 305/70R16-0.57%
- 33x12.50R17 vs 285/75R17+2.52%
- 33x12.50R17 vs 275/70R17-2.55%
Questions
Can I replace 33x12.50R17 with 315/70R17?
315/70R17 is outside the ±3% rule as a replacement for 33x12.50R17: the diameter differs by +4.13%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 33x12.50R17 and 315/70R17?
315/70R17 is 1.36" taller and 3 mm narrower; the sidewall is +0.68". At an indicated 60 mph you'd actually be doing 62.5 mph.
Will 315/70R17 fit on 33x12.50R17 wheels?
Both use a 17" rim, so the wheel diameter matches; check the wheel's width range for a 315 mm tire and the fender clearance.