TireSizesFinder

255/50R20 vs 285/35R22

285/35R22 is 0.19 in (4.7 mm) shorter than 255/50R20, a −0.62% diameter difference. With the speedometer set for 255/50R20, an indicated 60 mph is 59.6 mph on 285/35R22.

Is this a safe swap?

Diameter difference −0.62%: under 1%

By overall diameter alone, 285/35R22 is a near match for 255/50R20; the speedometer changes by less than 1%. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 255/50R20 (30.04 in) vs 285/35R22 (29.85 in)255/50R2030.04 in × 10.04 in285/35R2229.85 in × 11.22 in
Side profile and tread width, drawn to the same scale.
255/50R20 vs 285/35R22 differences
Measurement255/50R20285/35R22Difference% diff
Overall diameter30.04 in (763.0 mm)29.85 in (758.3 mm)−0.19 in (−4.7 mm)−0.62%
Sidewall height5.02 in (127.5 mm)3.93 in (99.8 mm)−1.09 in (−27.7 mm)−21.76%
Section width10.04 in (255.0 mm)11.22 in (285.0 mm)+1.18 in (+30.0 mm)+11.76%
Circumference94.37 in (2,397.0 mm)93.79 in (2,382.3 mm)−0.58 in (−14.8 mm)−0.62%
Revolutions per mile671676+4+0.62%
True speed with the speedometer calibrated for 255/50R20
IndicatedActual on 255/50R20Actual on 285/35R22Difference
30 mph30.0 mph29.8 mph−0.2 mph
60 mph60.0 mph59.6 mph−0.4 mph
75 mph75.0 mph74.5 mph−0.5 mph

Ride-height change: 285/35R22 lowers the vehicle by 0.09 in (2.4 mm) at the axle (half the −4.7 mm diameter difference).

285/35R22 is 0.19 in shorter than 255/50R20 and 30 mm wider, a 0.62% difference in overall diameter.

With the speedometer calibrated for 255/50R20, an indicated 60 mph is actually 59.6 mph on 285/35R22, and revolutions per mile change from 671 to 676.

285/35R22 mounts on a 22-inch wheel, a plus-2 fitment from the 20-inch wheel of 255/50R20.

Size pages

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