TireSizesFinder

315/35R20 vs 275/30R22

275/30R22 is 0.19 in (4.7 mm) shorter than 315/35R20, a −0.65% diameter difference. With the speedometer set for 315/35R20, an indicated 60 mph is 59.6 mph on 275/30R22.

Is this a safe swap?

Diameter difference −0.65%: under 1%

By overall diameter alone, 275/30R22 is a near match for 315/35R20; 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: 315/35R20 (28.68 in) vs 275/30R22 (28.50 in)315/35R2028.68 in × 12.40 in275/30R2228.50 in × 10.83 in
Side profile and tread width, drawn to the same scale.
315/35R20 vs 275/30R22 differences
Measurement315/35R20275/30R22Difference% diff
Overall diameter28.68 in (728.5 mm)28.50 in (723.8 mm)−0.19 in (−4.7 mm)−0.65%
Sidewall height4.34 in (110.3 mm)3.25 in (82.5 mm)−1.09 in (−27.7 mm)−25.17%
Section width12.40 in (315.0 mm)10.83 in (275.0 mm)−1.57 in (−40.0 mm)−12.70%
Circumference90.10 in (2,288.7 mm)89.52 in (2,273.9 mm)−0.58 in (−14.8 mm)−0.65%
Revolutions per mile703708+5+0.65%
True speed with the speedometer calibrated for 315/35R20
IndicatedActual on 315/35R20Actual on 275/30R22Difference
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: 275/30R22 lowers the vehicle by 0.09 in (2.4 mm) at the axle (half the −4.7 mm diameter difference).

275/30R22 is 0.19 in shorter than 315/35R20 and 40 mm narrower, a 0.65% difference in overall diameter.

With the speedometer calibrated for 315/35R20, an indicated 60 mph is actually 59.6 mph on 275/30R22, and revolutions per mile change from 703 to 708.

275/30R22 mounts on a 22-inch wheel, a plus-2 fitment from the 20-inch wheel of 315/35R20.

Size pages

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