245/75R17 vs 33x12.50R17
33x12.50R17 is outside the ±3% rule as a replacement for 245/75R17: the diameter differs by +4.87%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Side by side
| 245/75R17 | 33x12.50R17 | Difference | |
|---|---|---|---|
| Overall diameter | 31.47" | 33.00" | +1.53" (+4.87%) |
| Section width | 245 mm | 318 mm | +73 mm |
| Sidewall | 7.23" | 8.00" | +0.77" |
| Rim | 17" | 17" | same |
| Circumference | 98.9" | 103.7" | +4.8" |
| Revs per mile | 641 | 611 | -30 |
| Ride height | — | — | +0.77" |
| Speedometer reads 60 mph | 60.0 | 62.9 | +2.9 mph |
Speedometer and odometer
With 33x12.50R17 on a car calibrated for 245/75R17, the speedometer reads 57.2 mph when you're really doing 60, and the odometer under-counts by 4.9%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.5 mph |
| 45 mph | 47.2 mph |
| 60 mph | 62.9 mph |
| 70 mph | 73.4 mph |
| 80 mph | 83.9 mph |
Other sizes close to 245/75R17
- 245/75R17 vs 265/70R17+0.44%
- 245/75R17 vs 265/75R16+0.58%
- 245/75R17 vs 245/70R17-3.07%
- 245/75R17 vs 285/70R17+3.94%
- 245/75R17 vs 265/65R18+0.30%
- 245/75R17 vs 265/65R17-2.88%
- 245/75R17 vs 235/85R16+0.83%
- 245/75R17 vs 235/80R17+1.06%
- 245/75R17 vs 255/65R17-4.50%
- 245/75R17 vs 255/70R17-1.31%
- 245/75R17 vs 255/75R17+1.88%
- 245/75R17 vs 235/75R17-1.88%
Questions
Can I replace 245/75R17 with 33x12.50R17?
33x12.50R17 is outside the ±3% rule as a replacement for 245/75R17: the diameter differs by +4.87%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 245/75R17 and 33x12.50R17?
33x12.50R17 is 1.53" taller and 73 mm wider; the sidewall is +0.77". At an indicated 60 mph you'd actually be doing 62.9 mph.
Will 33x12.50R17 fit on 245/75R17 wheels?
Both use a 17" rim, so the wheel diameter matches; check the wheel's width range for a 318 mm tire and the fender clearance.