TireSizesFinder

265/55R20 vs 265/45R22

265/45R22 is 0.09 in (2.2 mm) shorter than 265/55R20, a −0.28% diameter difference. With the speedometer set for 265/55R20, an indicated 60 mph is 59.8 mph on 265/45R22.

Is this a safe swap?

Diameter difference −0.28%: under 1%

By overall diameter alone, 265/45R22 is a near match for 265/55R20; 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: 265/55R20 (31.48 in) vs 265/45R22 (31.39 in)265/55R2031.48 in × 10.43 in265/45R2231.39 in × 10.43 in
Side profile and tread width, drawn to the same scale.
265/55R20 vs 265/45R22 differences
Measurement265/55R20265/45R22Difference% diff
Overall diameter31.48 in (799.5 mm)31.39 in (797.3 mm)−0.09 in (−2.2 mm)−0.28%
Sidewall height5.74 in (145.8 mm)4.69 in (119.3 mm)−1.04 in (−26.5 mm)−18.18%
Section width10.43 in (265.0 mm)10.43 in (265.0 mm)0.00 in (0.0 mm)0.00%
Circumference98.89 in (2,511.7 mm)98.61 in (2,504.8 mm)−0.27 in (−6.9 mm)−0.28%
Revolutions per mile641643+2+0.28%
True speed with the speedometer calibrated for 265/55R20
IndicatedActual on 265/55R20Actual on 265/45R22Difference
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: 265/45R22 lowers the vehicle by 0.04 in (1.1 mm) at the axle (half the −2.2 mm diameter difference).

265/45R22 is 0.09 in shorter than 265/55R20 and the same width, a 0.28% difference in overall diameter.

With the speedometer calibrated for 265/55R20, an indicated 60 mph is actually 59.8 mph on 265/45R22, and revolutions per mile change from 641 to 643.

265/45R22 mounts on a 22-inch wheel, a plus-2 fitment from the 20-inch wheel of 265/55R20.

Size pages

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