TireSizesFinder

325/30R21 vs 245/35R22

245/35R22 is 0.07 in (1.9 mm) taller than 325/30R21, a +0.26% diameter difference. With the speedometer set for 325/30R21, an indicated 60 mph is 60.2 mph on 245/35R22.

Is this a safe swap?

Diameter difference +0.26%: under 1%

By overall diameter alone, 245/35R22 is a near match for 325/30R21; 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: 325/30R21 (28.68 in) vs 245/35R22 (28.75 in)325/30R2128.68 in × 12.80 in245/35R2228.75 in × 9.65 in
Side profile and tread width, drawn to the same scale.
325/30R21 vs 245/35R22 differences
Measurement325/30R21245/35R22Difference% diff
Overall diameter28.68 in (728.4 mm)28.75 in (730.3 mm)+0.07 in (+1.9 mm)+0.26%
Sidewall height3.84 in (97.5 mm)3.38 in (85.8 mm)−0.46 in (−11.7 mm)−12.05%
Section width12.80 in (325.0 mm)9.65 in (245.0 mm)−3.15 in (−80.0 mm)−24.62%
Circumference90.09 in (2,288.3 mm)90.33 in (2,294.3 mm)+0.24 in (+6.0 mm)+0.26%
Revolutions per mile703701−2−0.26%
True speed with the speedometer calibrated for 325/30R21
IndicatedActual on 325/30R21Actual on 245/35R22Difference
30 mph30.0 mph30.1 mph+0.1 mph
60 mph60.0 mph60.2 mph+0.2 mph
75 mph75.0 mph75.2 mph+0.2 mph

Ride-height change: 245/35R22 raises the vehicle by 0.04 in (0.9 mm) at the axle (half the +1.9 mm diameter difference).

245/35R22 is 0.07 in taller than 325/30R21 and 80 mm narrower, a 0.26% difference in overall diameter.

With the speedometer calibrated for 325/30R21, an indicated 60 mph is actually 60.2 mph on 245/35R22, and revolutions per mile change from 703 to 701.

245/35R22 mounts on a 22-inch wheel, a plus-1 fitment from the 21-inch wheel of 325/30R21.

Size pages

Other comparisons with 325/30R21

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