235/80R17 vs 33x12.50R17
33x12.50R17 is outside the ±3% rule as a replacement for 235/80R17: the diameter differs by +3.76%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Side by side
| 235/80R17 | 33x12.50R17 | Difference | |
|---|---|---|---|
| Overall diameter | 31.80" | 33.00" | +1.20" (+3.76%) |
| Section width | 235 mm | 318 mm | +83 mm |
| Sidewall | 7.40" | 8.00" | +0.60" |
| Rim | 17" | 17" | same |
| Circumference | 99.9" | 103.7" | +3.8" |
| Revs per mile | 634 | 611 | -23 |
| Ride height | — | — | +0.60" |
| Speedometer reads 60 mph | 60.0 | 62.3 | +2.3 mph |
Speedometer and odometer
With 33x12.50R17 on a car calibrated for 235/80R17, the speedometer reads 57.8 mph when you're really doing 60, and the odometer under-counts by 3.8%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.1 mph |
| 45 mph | 46.7 mph |
| 60 mph | 62.3 mph |
| 70 mph | 72.6 mph |
| 80 mph | 83.0 mph |
Other sizes close to 235/80R17
- 235/80R17 vs 265/70R17-0.62%
- 235/80R17 vs 275/65R18+0.85%
- 235/80R17 vs 265/75R16-0.48%
- 235/80R17 vs 245/70R17-4.09%
- 235/80R17 vs 285/70R17+2.85%
- 235/80R17 vs 265/65R18-0.76%
- 235/80R17 vs 245/75R17-1.05%
- 235/80R17 vs 265/65R17-3.90%
- 235/80R17 vs 235/85R16-0.24%
- 235/80R17 vs 255/70R18+0.79%
- 235/80R17 vs 255/70R17-2.35%
- 235/80R17 vs 255/75R17+0.80%
Questions
Can I replace 235/80R17 with 33x12.50R17?
33x12.50R17 is outside the ±3% rule as a replacement for 235/80R17: the diameter differs by +3.76%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 235/80R17 and 33x12.50R17?
33x12.50R17 is 1.20" taller and 83 mm wider; the sidewall is +0.60". At an indicated 60 mph you'd actually be doing 62.3 mph.
Will 33x12.50R17 fit on 235/80R17 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.