TireSizesFinder

295/35R21 vs 315/30R22

315/30R22 is 0.31 in (7.9 mm) taller than 295/35R21, a +1.07% diameter difference. With the speedometer set for 295/35R21, an indicated 60 mph is 60.6 mph on 315/30R22.

Is this a safe swap?

Diameter difference +1.07%: within the ±3% guideline

By overall diameter alone, 315/30R22 falls inside the ±3% range commonly used as a guideline when replacing 295/35R21. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 295/35R21 (29.13 in) vs 315/30R22 (29.44 in)295/35R2129.13 in × 11.61 in315/30R2229.44 in × 12.40 in
Side profile and tread width, drawn to the same scale.
295/35R21 vs 315/30R22 differences
Measurement295/35R21315/30R22Difference% diff
Overall diameter29.13 in (739.9 mm)29.44 in (747.8 mm)+0.31 in (+7.9 mm)+1.07%
Sidewall height4.06 in (103.3 mm)3.72 in (94.5 mm)−0.34 in (−8.7 mm)−8.47%
Section width11.61 in (295.0 mm)12.40 in (315.0 mm)+0.79 in (+20.0 mm)+6.78%
Circumference91.51 in (2,324.5 mm)92.49 in (2,349.3 mm)+0.98 in (+24.8 mm)+1.07%
Revolutions per mile692685−7−1.06%
True speed with the speedometer calibrated for 295/35R21
IndicatedActual on 295/35R21Actual on 315/30R22Difference
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: 315/30R22 raises the vehicle by 0.16 in (3.9 mm) at the axle (half the +7.9 mm diameter difference).

315/30R22 is 0.31 in taller than 295/35R21 and 20 mm wider, a 1.07% difference in overall diameter.

With the speedometer calibrated for 295/35R21, an indicated 60 mph is actually 60.6 mph on 315/30R22, and revolutions per mile change from 692 to 685.

315/30R22 mounts on a 22-inch wheel, a plus-1 fitment from the 21-inch wheel of 295/35R21.

Size pages

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