TireSizesFinder

295/30R21 vs 245/30R22

245/30R22 is 0.18 in (4.6 mm) shorter than 295/30R21, a −0.65% diameter difference. With the speedometer set for 295/30R21, an indicated 60 mph is 59.6 mph on 245/30R22.

Is this a safe swap?

Diameter difference −0.65%: under 1%

By overall diameter alone, 245/30R22 is a near match for 295/30R21; 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: 295/30R21 (27.97 in) vs 245/30R22 (27.79 in)295/30R2127.97 in × 11.61 in245/30R2227.79 in × 9.65 in
Side profile and tread width, drawn to the same scale.
295/30R21 vs 245/30R22 differences
Measurement295/30R21245/30R22Difference% diff
Overall diameter27.97 in (710.4 mm)27.79 in (705.8 mm)−0.18 in (−4.6 mm)−0.65%
Sidewall height3.48 in (88.5 mm)2.89 in (73.5 mm)−0.59 in (−15.0 mm)−16.95%
Section width11.61 in (295.0 mm)9.65 in (245.0 mm)−1.97 in (−50.0 mm)−16.95%
Circumference87.87 in (2,231.8 mm)87.30 in (2,217.3 mm)−0.57 in (−14.5 mm)−0.65%
Revolutions per mile721726+5+0.65%
True speed with the speedometer calibrated for 295/30R21
IndicatedActual on 295/30R21Actual on 245/30R22Difference
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: 245/30R22 lowers the vehicle by 0.09 in (2.3 mm) at the axle (half the −4.6 mm diameter difference).

245/30R22 is 0.18 in shorter than 295/30R21 and 50 mm narrower, a 0.65% difference in overall diameter.

With the speedometer calibrated for 295/30R21, an indicated 60 mph is actually 59.6 mph on 245/30R22, and revolutions per mile change from 721 to 726.

245/30R22 mounts on a 22-inch wheel, a plus-1 fitment from the 21-inch wheel of 295/30R21.

Size pages

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