33x12.50R22 vs 285/50R22
285/50R22 is a safe swap for 33x12.50R22 by the usual ±3% rule: the diameter differs by +0.67%.
Side by side
| 33x12.50R22 | 285/50R22 | Difference | |
|---|---|---|---|
| Overall diameter | 33.00" | 33.22" | +0.22" (+0.67%) |
| Section width | 318 mm | 285 mm | -33 mm |
| Sidewall | 5.50" | 5.61" | +0.11" |
| Rim | 22" | 22" | same |
| Circumference | 103.7" | 104.4" | +0.7" |
| Revs per mile | 611 | 607 | -4 |
| Ride height | — | — | +0.11" |
| Speedometer reads 60 mph | 60.0 | 60.4 | +0.4 mph |
Speedometer and odometer
With 285/50R22 on a car calibrated for 33x12.50R22, the speedometer reads 59.6 mph when you're really doing 60, and the odometer under-counts by 0.7%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.2 mph |
| 45 mph | 45.3 mph |
| 60 mph | 60.4 mph |
| 70 mph | 70.5 mph |
| 80 mph | 80.5 mph |
Other sizes close to 33x12.50R22
Questions
Can I replace 33x12.50R22 with 285/50R22?
285/50R22 is a safe swap for 33x12.50R22 by the usual ±3% rule: the diameter differs by +0.67%.
What's the difference between 33x12.50R22 and 285/50R22?
285/50R22 is 0.22" taller and 33 mm narrower; the sidewall is +0.11". At an indicated 60 mph you'd actually be doing 60.4 mph.
Will 285/50R22 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.