33x12.50R17 vs 255/85R16
255/85R16 is a safe swap for 33x12.50R17 by the usual ±3% rule: the diameter differs by +0.20%.
Side by side
| 33x12.50R17 | 255/85R16 | Difference | |
|---|---|---|---|
| Overall diameter | 33.00" | 33.07" | +0.07" (+0.20%) |
| Section width | 318 mm | 255 mm | -63 mm |
| Sidewall | 8.00" | 8.53" | +0.53" |
| Rim | 17" | 16" | -1" |
| Circumference | 103.7" | 103.9" | +0.2" |
| Revs per mile | 611 | 610 | -1 |
| Ride height | — | — | +0.03" |
| Speedometer reads 60 mph | 60.0 | 60.1 | +0.1 mph |
Speedometer and odometer
With 255/85R16 on a car calibrated for 33x12.50R17, the speedometer reads 59.9 mph when you're really doing 60, and the odometer under-counts by 0.2%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.1 mph |
| 45 mph | 45.1 mph |
| 60 mph | 60.1 mph |
| 70 mph | 70.1 mph |
| 80 mph | 80.2 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 315/70R17+4.13%
- 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%
Questions
Can I replace 33x12.50R17 with 255/85R16?
255/85R16 is a safe swap for 33x12.50R17 by the usual ±3% rule: the diameter differs by +0.20%.
What's the difference between 33x12.50R17 and 255/85R16?
255/85R16 is 0.07" taller and 63 mm narrower; the sidewall is +0.53". At an indicated 60 mph you'd actually be doing 60.1 mph.
Will 255/85R16 fit on 33x12.50R17 wheels?
No — 33x12.50R17 needs a 17" wheel and 255/85R16 a 16" wheel. This is a plus/minus-size swap that changes wheels too.