33x12.50R22 vs 285/55R22
285/55R22 is outside the ±3% rule as a replacement for 33x12.50R22: the diameter differs by +4.07%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Side by side
| 33x12.50R22 | 285/55R22 | Difference | |
|---|---|---|---|
| Overall diameter | 33.00" | 34.34" | +1.34" (+4.07%) |
| Section width | 318 mm | 285 mm | -33 mm |
| Sidewall | 5.50" | 6.17" | +0.67" |
| Rim | 22" | 22" | same |
| Circumference | 103.7" | 107.9" | +4.2" |
| Revs per mile | 611 | 587 | -24 |
| Ride height | — | — | +0.67" |
| Speedometer reads 60 mph | 60.0 | 62.4 | +2.4 mph |
Speedometer and odometer
With 285/55R22 on a car calibrated for 33x12.50R22, the speedometer reads 57.7 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 | 46.8 mph |
| 60 mph | 62.4 mph |
| 70 mph | 72.8 mph |
| 80 mph | 83.3 mph |
Other sizes close to 33x12.50R22
Questions
Can I replace 33x12.50R22 with 285/55R22?
285/55R22 is outside the ±3% rule as a replacement for 33x12.50R22: the diameter differs by +4.07%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 33x12.50R22 and 285/55R22?
285/55R22 is 1.34" taller and 33 mm narrower; the sidewall is +0.67". At an indicated 60 mph you'd actually be doing 62.4 mph.
Will 285/55R22 fit on 33x12.50R22 wheels?
Both use a 22" rim, so the wheel diameter matches; check the wheel's width range for a 285 mm tire and the fender clearance.