TireSizesFinder

235/45R20 vs 265/30R22

265/30R22 is 0.07 in (1.7 mm) shorter than 235/45R20, a −0.24% diameter difference. With the speedometer set for 235/45R20, an indicated 60 mph is 59.9 mph on 265/30R22.

Is this a safe swap?

Diameter difference −0.24%: under 1%

By overall diameter alone, 265/30R22 is a near match for 235/45R20; 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: 235/45R20 (28.33 in) vs 265/30R22 (28.26 in)235/45R2028.33 in × 9.25 in265/30R2228.26 in × 10.43 in
Side profile and tread width, drawn to the same scale.
235/45R20 vs 265/30R22 differences
Measurement235/45R20265/30R22Difference% diff
Overall diameter28.33 in (719.5 mm)28.26 in (717.8 mm)−0.07 in (−1.7 mm)−0.24%
Sidewall height4.16 in (105.8 mm)3.13 in (79.5 mm)−1.03 in (−26.2 mm)−24.82%
Section width9.25 in (235.0 mm)10.43 in (265.0 mm)+1.18 in (+30.0 mm)+12.77%
Circumference88.99 in (2,260.4 mm)88.78 in (2,255.0 mm)−0.21 in (−5.3 mm)−0.24%
Revolutions per mile712714+2+0.24%
True speed with the speedometer calibrated for 235/45R20
IndicatedActual on 235/45R20Actual on 265/30R22Difference
30 mph30.0 mph29.9 mph−0.1 mph
60 mph60.0 mph59.9 mph−0.1 mph
75 mph75.0 mph74.8 mph−0.2 mph

Ride-height change: 265/30R22 lowers the vehicle by 0.03 in (0.9 mm) at the axle (half the −1.7 mm diameter difference).

265/30R22 is 0.07 in shorter than 235/45R20 and 30 mm wider, a 0.24% difference in overall diameter.

With the speedometer calibrated for 235/45R20, an indicated 60 mph is actually 59.9 mph on 265/30R22, and revolutions per mile change from 712 to 714.

265/30R22 mounts on a 22-inch wheel, a plus-2 fitment from the 20-inch wheel of 235/45R20.

Size pages

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