TireSizesFinder

295/40R21 vs 275/40R22

275/40R22 is 0.37 in (9.4 mm) taller than 295/40R21, a +1.22% diameter difference. With the speedometer set for 295/40R21, an indicated 60 mph is 60.7 mph on 275/40R22.

Is this a safe swap?

Diameter difference +1.22%: within the ±3% guideline

By overall diameter alone, 275/40R22 falls inside the ±3% range commonly used as a guideline when replacing 295/40R21. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 295/40R21 (30.29 in) vs 275/40R22 (30.66 in)295/40R2130.29 in × 11.61 in275/40R2230.66 in × 10.83 in
Side profile and tread width, drawn to the same scale.
295/40R21 vs 275/40R22 differences
Measurement295/40R21275/40R22Difference% diff
Overall diameter30.29 in (769.4 mm)30.66 in (778.8 mm)+0.37 in (+9.4 mm)+1.22%
Sidewall height4.65 in (118.0 mm)4.33 in (110.0 mm)−0.31 in (−8.0 mm)−6.78%
Section width11.61 in (295.0 mm)10.83 in (275.0 mm)−0.79 in (−20.0 mm)−6.78%
Circumference95.16 in (2,417.1 mm)96.33 in (2,446.7 mm)+1.16 in (+29.5 mm)+1.22%
Revolutions per mile666658−8−1.21%
True speed with the speedometer calibrated for 295/40R21
IndicatedActual on 295/40R21Actual on 275/40R22Difference
30 mph30.0 mph30.4 mph+0.4 mph
60 mph60.0 mph60.7 mph+0.7 mph
75 mph75.0 mph75.9 mph+0.9 mph

Ride-height change: 275/40R22 raises the vehicle by 0.19 in (4.7 mm) at the axle (half the +9.4 mm diameter difference).

275/40R22 is 0.37 in taller than 295/40R21 and 20 mm narrower, a 1.22% difference in overall diameter.

With the speedometer calibrated for 295/40R21, an indicated 60 mph is actually 60.7 mph on 275/40R22, and revolutions per mile change from 666 to 658.

275/40R22 mounts on a 22-inch wheel, a plus-1 fitment from the 21-inch wheel of 295/40R21.

Size pages

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