TireSizesFinder

275/55R20 vs 265/45R22

265/45R22 is 0.52 in (13.2 mm) shorter than 275/55R20, a −1.63% diameter difference. With the speedometer set for 275/55R20, an indicated 60 mph is 59.0 mph on 265/45R22.

Is this a safe swap?

Diameter difference −1.63%: within the ±3% guideline

By overall diameter alone, 265/45R22 falls inside the ±3% range commonly used as a guideline when replacing 275/55R20. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 275/55R20 (31.91 in) vs 265/45R22 (31.39 in)275/55R2031.91 in × 10.83 in265/45R2231.39 in × 10.43 in
Side profile and tread width, drawn to the same scale.
275/55R20 vs 265/45R22 differences
Measurement275/55R20265/45R22Difference% diff
Overall diameter31.91 in (810.5 mm)31.39 in (797.3 mm)−0.52 in (−13.2 mm)−1.63%
Sidewall height5.95 in (151.3 mm)4.69 in (119.3 mm)−1.26 in (−32.0 mm)−21.16%
Section width10.83 in (275.0 mm)10.43 in (265.0 mm)−0.39 in (−10.0 mm)−3.64%
Circumference100.25 in (2,546.3 mm)98.61 in (2,504.8 mm)−1.63 in (−41.5 mm)−1.63%
Revolutions per mile632643+10+1.66%
True speed with the speedometer calibrated for 275/55R20
IndicatedActual on 275/55R20Actual on 265/45R22Difference
30 mph30.0 mph29.5 mph−0.5 mph
60 mph60.0 mph59.0 mph−1.0 mph
75 mph75.0 mph73.8 mph−1.2 mph

Ride-height change: 265/45R22 lowers the vehicle by 0.26 in (6.6 mm) at the axle (half the −13.2 mm diameter difference).

265/45R22 is 0.52 in shorter than 275/55R20 and 10 mm narrower, a 1.63% difference in overall diameter.

With the speedometer calibrated for 275/55R20, an indicated 60 mph is actually 59.0 mph on 265/45R22, and revolutions per mile change from 632 to 643.

265/45R22 mounts on a 22-inch wheel, a plus-2 fitment from the 20-inch wheel of 275/55R20.

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