255/45R20 vs 265/35R22

265/35R22 is 0.27 in (6.8 mm) taller than 255/45R20, a +0.92% diameter difference. With the speedometer set for 255/45R20, an indicated 60 mph is 60.6 mph on 265/35R22.

Is this a safe swap?

Diameter difference +0.92%: under 1%

By overall diameter alone, 265/35R22 is a near match for 255/45R20; the speedometer changes by less than 1%. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

Side profile and tread width, drawn to the same scale.

255/45R20 vs 265/35R22 differences
Measurement	255/45R20	265/35R22	Difference	% diff
Overall diameter	29.04 in (737.5 mm)	29.30 in (744.3 mm)	+0.27 in (+6.8 mm)	+0.92%
Sidewall height	4.52 in (114.8 mm)	3.65 in (92.8 mm)	−0.87 in (−22.0 mm)	−19.17%
Section width	10.04 in (255.0 mm)	10.43 in (265.0 mm)	+0.39 in (+10.0 mm)	+3.92%
Circumference	91.22 in (2,316.9 mm)	92.06 in (2,338.3 mm)	+0.84 in (+21.4 mm)	+0.92%
Revolutions per mile	695	688	−6	−0.91%

True speed with the speedometer calibrated for 255/45R20
Indicated	Actual on 255/45R20	Actual on 265/35R22	Difference
30 mph	30.0 mph	30.3 mph	+0.3 mph
60 mph	60.0 mph	60.6 mph	+0.6 mph
75 mph	75.0 mph	75.7 mph	+0.7 mph

Ride-height change: 265/35R22 raises the vehicle by 0.13 in (3.4 mm) at the axle (half the +6.8 mm diameter difference).

265/35R22 is 0.27 in taller than 255/45R20 and 10 mm wider, a 0.92% difference in overall diameter.

With the speedometer calibrated for 255/45R20, an indicated 60 mph is actually 60.6 mph on 265/35R22, and revolutions per mile change from 695 to 688.

265/35R22 mounts on a 22-inch wheel, a plus-2 fitment from the 20-inch wheel of 255/45R20.

Size pages

Other comparisons with 255/45R20

Other comparisons with 265/35R22

Source: Calculated from standard tire geometry formulas. Verified 2026-09-27. How these numbers are calculated.