TireSizesFinder

285/55R20 vs 33x12.50R22

33x12.50R22 is 0.66 in (16.7 mm) taller than 285/55R20, a +2.03% diameter difference. With the speedometer set for 285/55R20, an indicated 60 mph is 61.2 mph on 33x12.50R22.

Is this a safe swap?

Diameter difference +2.03%: within the ±3% guideline

By overall diameter alone, 33x12.50R22 falls inside the ±3% range commonly used as a guideline when replacing 285/55R20. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 285/55R20 (32.34 in) vs 33x12.50R22 (33.00 in)285/55R2032.34 in × 11.22 in33x12.50R2233.00 in × 12.50 in
Side profile and tread width, drawn to the same scale.
285/55R20 vs 33x12.50R22 differences
Measurement285/55R2033x12.50R22Difference% diff
Overall diameter32.34 in (821.5 mm)33.00 in (838.2 mm)+0.66 in (+16.7 mm)+2.03%
Sidewall height6.17 in (156.8 mm)5.50 in (139.7 mm)−0.67 in (−17.1 mm)−10.88%
Section width11.22 in (285.0 mm)12.50 in (317.5 mm)+1.28 in (+32.5 mm)+11.40%
Circumference101.61 in (2,580.8 mm)103.67 in (2,633.3 mm)+2.07 in (+52.5 mm)+2.03%
Revolutions per mile624611−12−1.99%
True speed with the speedometer calibrated for 285/55R20
IndicatedActual on 285/55R20Actual on 33x12.50R22Difference
30 mph30.0 mph30.6 mph+0.6 mph
60 mph60.0 mph61.2 mph+1.2 mph
75 mph75.0 mph76.5 mph+1.5 mph

Ride-height change: 33x12.50R22 raises the vehicle by 0.33 in (8.3 mm) at the axle (half the +16.7 mm diameter difference).

33x12.50R22 is 0.66 in taller than 285/55R20 and 33 mm wider, a 2.03% difference in overall diameter.

With the speedometer calibrated for 285/55R20, an indicated 60 mph is actually 61.2 mph on 33x12.50R22, and revolutions per mile change from 624 to 611.

33x12.50R22 mounts on a 22-inch wheel, a plus-2 fitment from the 20-inch wheel of 285/55R20.

Size pages

Other comparisons with 285/55R20

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Source: Calculated from standard tire geometry formulas. Verified . How these numbers are calculated.