TireSizesFinder

265/50R20 vs 265/40R22

265/40R22 is 0.09 in (2.2 mm) shorter than 265/50R20, a −0.28% diameter difference. With the speedometer set for 265/50R20, an indicated 60 mph is 59.8 mph on 265/40R22.

Is this a safe swap?

Diameter difference −0.28%: under 1%

By overall diameter alone, 265/40R22 is a near match for 265/50R20; 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: 265/50R20 (30.43 in) vs 265/40R22 (30.35 in)265/50R2030.43 in × 10.43 in265/40R2230.35 in × 10.43 in
Side profile and tread width, drawn to the same scale.
265/50R20 vs 265/40R22 differences
Measurement265/50R20265/40R22Difference% diff
Overall diameter30.43 in (773.0 mm)30.35 in (770.8 mm)−0.09 in (−2.2 mm)−0.28%
Sidewall height5.22 in (132.5 mm)4.17 in (106.0 mm)−1.04 in (−26.5 mm)−20.00%
Section width10.43 in (265.0 mm)10.43 in (265.0 mm)0.00 in (0.0 mm)0.00%
Circumference95.61 in (2,428.5 mm)95.34 in (2,421.5 mm)−0.27 in (−6.9 mm)−0.28%
Revolutions per mile663665+2+0.29%
True speed with the speedometer calibrated for 265/50R20
IndicatedActual on 265/50R20Actual on 265/40R22Difference
30 mph30.0 mph29.9 mph−0.1 mph
60 mph60.0 mph59.8 mph−0.2 mph
75 mph75.0 mph74.8 mph−0.2 mph

Ride-height change: 265/40R22 lowers the vehicle by 0.04 in (1.1 mm) at the axle (half the −2.2 mm diameter difference).

265/40R22 is 0.09 in shorter than 265/50R20 and the same width, a 0.28% difference in overall diameter.

With the speedometer calibrated for 265/50R20, an indicated 60 mph is actually 59.8 mph on 265/40R22, and revolutions per mile change from 663 to 665.

265/40R22 mounts on a 22-inch wheel, a plus-2 fitment from the 20-inch wheel of 265/50R20.

Size pages

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