TireSizesFinder

325/30R21 vs 295/30R22

295/30R22 is 0.29 in (7.4 mm) taller than 325/30R21, a +1.02% diameter difference. With the speedometer set for 325/30R21, an indicated 60 mph is 60.6 mph on 295/30R22.

Is this a safe swap?

Diameter difference +1.02%: within the ±3% guideline

By overall diameter alone, 295/30R22 falls inside the ±3% range commonly used as a guideline when replacing 325/30R21. 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 295/30R22 (28.97 in)325/30R2128.68 in × 12.80 in295/30R2228.97 in × 11.61 in
Side profile and tread width, drawn to the same scale.
325/30R21 vs 295/30R22 differences
Measurement325/30R21295/30R22Difference% diff
Overall diameter28.68 in (728.4 mm)28.97 in (735.8 mm)+0.29 in (+7.4 mm)+1.02%
Sidewall height3.84 in (97.5 mm)3.48 in (88.5 mm)−0.35 in (−9.0 mm)−9.23%
Section width12.80 in (325.0 mm)11.61 in (295.0 mm)−1.18 in (−30.0 mm)−9.23%
Circumference90.09 in (2,288.3 mm)91.01 in (2,311.6 mm)+0.92 in (+23.2 mm)+1.02%
Revolutions per mile703696−7−1.01%
True speed with the speedometer calibrated for 325/30R21
IndicatedActual on 325/30R21Actual on 295/30R22Difference
30 mph30.0 mph30.3 mph+0.3 mph
60 mph60.0 mph60.6 mph+0.6 mph
75 mph75.0 mph75.8 mph+0.8 mph

Ride-height change: 295/30R22 raises the vehicle by 0.15 in (3.7 mm) at the axle (half the +7.4 mm diameter difference).

295/30R22 is 0.29 in taller than 325/30R21 and 30 mm narrower, a 1.02% difference in overall diameter.

With the speedometer calibrated for 325/30R21, an indicated 60 mph is actually 60.6 mph on 295/30R22, and revolutions per mile change from 703 to 696.

295/30R22 mounts on a 22-inch wheel, a plus-1 fitment from the 21-inch wheel of 325/30R21.

Size pages

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