TireSizesFinder

285/40R20 vs 245/35R22

245/35R22 is 0.22 in (5.7 mm) shorter than 285/40R20, a −0.77% diameter difference. With the speedometer set for 285/40R20, an indicated 60 mph is 59.5 mph on 245/35R22.

Is this a safe swap?

Diameter difference −0.77%: under 1%

By overall diameter alone, 245/35R22 is a near match for 285/40R20; 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: 285/40R20 (28.98 in) vs 245/35R22 (28.75 in)285/40R2028.98 in × 11.22 in245/35R2228.75 in × 9.65 in
Side profile and tread width, drawn to the same scale.
285/40R20 vs 245/35R22 differences
Measurement285/40R20245/35R22Difference% diff
Overall diameter28.98 in (736.0 mm)28.75 in (730.3 mm)−0.22 in (−5.7 mm)−0.77%
Sidewall height4.49 in (114.0 mm)3.38 in (85.8 mm)−1.11 in (−28.2 mm)−24.78%
Section width11.22 in (285.0 mm)9.65 in (245.0 mm)−1.57 in (−40.0 mm)−14.04%
Circumference91.03 in (2,312.2 mm)90.33 in (2,294.3 mm)−0.71 in (−17.9 mm)−0.77%
Revolutions per mile696701+5+0.78%
True speed with the speedometer calibrated for 285/40R20
IndicatedActual on 285/40R20Actual on 245/35R22Difference
30 mph30.0 mph29.8 mph−0.2 mph
60 mph60.0 mph59.5 mph−0.5 mph
75 mph75.0 mph74.4 mph−0.6 mph

Ride-height change: 245/35R22 lowers the vehicle by 0.11 in (2.9 mm) at the axle (half the −5.7 mm diameter difference).

245/35R22 is 0.22 in shorter than 285/40R20 and 40 mm narrower, a 0.77% difference in overall diameter.

With the speedometer calibrated for 285/40R20, an indicated 60 mph is actually 59.5 mph on 245/35R22, and revolutions per mile change from 696 to 701.

245/35R22 mounts on a 22-inch wheel, a plus-2 fitment from the 20-inch wheel of 285/40R20.

Size pages

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