TireSizesFinder

285/45R20 vs 265/40R22

265/40R22 is 0.25 in (6.3 mm) taller than 285/45R20, a +0.82% diameter difference. With the speedometer set for 285/45R20, an indicated 60 mph is 60.5 mph on 265/40R22.

Is this a safe swap?

Diameter difference +0.82%: under 1%

By overall diameter alone, 265/40R22 is a near match for 285/45R20; 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: 285/45R20 (30.10 in) vs 265/40R22 (30.35 in)285/45R2030.10 in × 11.22 in265/40R2230.35 in × 10.43 in
Side profile and tread width, drawn to the same scale.
285/45R20 vs 265/40R22 differences
Measurement285/45R20265/40R22Difference% diff
Overall diameter30.10 in (764.5 mm)30.35 in (770.8 mm)+0.25 in (+6.3 mm)+0.82%
Sidewall height5.05 in (128.3 mm)4.17 in (106.0 mm)−0.88 in (−22.2 mm)−17.35%
Section width11.22 in (285.0 mm)10.43 in (265.0 mm)−0.79 in (−20.0 mm)−7.02%
Circumference94.56 in (2,401.7 mm)95.34 in (2,421.5 mm)+0.78 in (+19.8 mm)+0.82%
Revolutions per mile670665−5−0.82%
True speed with the speedometer calibrated for 285/45R20
IndicatedActual on 285/45R20Actual on 265/40R22Difference
30 mph30.0 mph30.2 mph+0.2 mph
60 mph60.0 mph60.5 mph+0.5 mph
75 mph75.0 mph75.6 mph+0.6 mph

Ride-height change: 265/40R22 raises the vehicle by 0.12 in (3.1 mm) at the axle (half the +6.3 mm diameter difference).

265/40R22 is 0.25 in taller than 285/45R20 and 20 mm narrower, a 0.82% difference in overall diameter.

With the speedometer calibrated for 285/45R20, an indicated 60 mph is actually 60.5 mph on 265/40R22, and revolutions per mile change from 670 to 665.

265/40R22 mounts on a 22-inch wheel, a plus-2 fitment from the 20-inch wheel of 285/45R20.

Size pages

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