TireSizesFinder

245/40R21 vs 245/35R22

245/35R22 is 0.04 in (0.9 mm) taller than 245/40R21, a +0.12% diameter difference. With the speedometer set for 245/40R21, an indicated 60 mph is 60.1 mph on 245/35R22.

Is this a safe swap?

Diameter difference +0.12%: under 1%

By overall diameter alone, 245/35R22 is a near match for 245/40R21; 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: 245/40R21 (28.72 in) vs 245/35R22 (28.75 in)245/40R2128.72 in × 9.65 in245/35R2228.75 in × 9.65 in
Side profile and tread width, drawn to the same scale.
245/40R21 vs 245/35R22 differences
Measurement245/40R21245/35R22Difference% diff
Overall diameter28.72 in (729.4 mm)28.75 in (730.3 mm)+0.04 in (+0.9 mm)+0.12%
Sidewall height3.86 in (98.0 mm)3.38 in (85.8 mm)−0.48 in (−12.2 mm)−12.50%
Section width9.65 in (245.0 mm)9.65 in (245.0 mm)0.00 in (0.0 mm)0.00%
Circumference90.22 in (2,291.5 mm)90.33 in (2,294.3 mm)+0.11 in (+2.8 mm)+0.12%
Revolutions per mile702701−1−0.12%
True speed with the speedometer calibrated for 245/40R21
IndicatedActual on 245/40R21Actual on 245/35R22Difference
30 mph30.0 mph30.0 mph0.0 mph
60 mph60.0 mph60.1 mph+0.1 mph
75 mph75.0 mph75.1 mph+0.1 mph

Ride-height change: 245/35R22 raises the vehicle by 0.02 in (0.4 mm) at the axle (half the +0.9 mm diameter difference).

245/35R22 is 0.04 in taller than 245/40R21 and the same width, a 0.12% difference in overall diameter.

With the speedometer calibrated for 245/40R21, an indicated 60 mph is actually 60.1 mph on 245/35R22, and revolutions per mile change from 702 to 701.

245/35R22 mounts on a 22-inch wheel, a plus-1 fitment from the 21-inch wheel of 245/40R21.

Size pages

Other comparisons with 245/40R21

Other comparisons with 245/35R22

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