TireSizesFinder

285/35R20 vs 245/30R22

245/30R22 is 0.07 in (1.7 mm) shorter than 285/35R20, a −0.24% diameter difference. With the speedometer set for 285/35R20, an indicated 60 mph is 59.9 mph on 245/30R22.

Is this a safe swap?

Diameter difference −0.24%: under 1%

By overall diameter alone, 245/30R22 is a near match for 285/35R20; 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: 285/35R20 (27.85 in) vs 245/30R22 (27.79 in)285/35R2027.85 in × 11.22 in245/30R2227.79 in × 9.65 in
Side profile and tread width, drawn to the same scale.
285/35R20 vs 245/30R22 differences
Measurement285/35R20245/30R22Difference% diff
Overall diameter27.85 in (707.5 mm)27.79 in (705.8 mm)−0.07 in (−1.7 mm)−0.24%
Sidewall height3.93 in (99.8 mm)2.89 in (73.5 mm)−1.03 in (−26.2 mm)−26.32%
Section width11.22 in (285.0 mm)9.65 in (245.0 mm)−1.57 in (−40.0 mm)−14.04%
Circumference87.51 in (2,222.7 mm)87.30 in (2,217.3 mm)−0.21 in (−5.3 mm)−0.24%
Revolutions per mile724726+2+0.24%
True speed with the speedometer calibrated for 285/35R20
IndicatedActual on 285/35R20Actual on 245/30R22Difference
30 mph30.0 mph29.9 mph−0.1 mph
60 mph60.0 mph59.9 mph−0.1 mph
75 mph75.0 mph74.8 mph−0.2 mph

Ride-height change: 245/30R22 lowers the vehicle by 0.03 in (0.9 mm) at the axle (half the −1.7 mm diameter difference).

245/30R22 is 0.07 in shorter than 285/35R20 and 40 mm narrower, a 0.24% difference in overall diameter.

With the speedometer calibrated for 285/35R20, an indicated 60 mph is actually 59.9 mph on 245/30R22, and revolutions per mile change from 724 to 726.

245/30R22 mounts on a 22-inch wheel, a plus-2 fitment from the 20-inch wheel of 285/35R20.

Size pages

Other comparisons with 285/35R20

Other comparisons with 245/30R22

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