285/40R20 vs 265/35R22

265/35R22 is 0.33 in (8.3 mm) taller than 285/40R20, a +1.13% diameter difference. With the speedometer set for 285/40R20, an indicated 60 mph is 60.7 mph on 265/35R22.

Is this a safe swap?

Diameter difference +1.13%: within the ±3% guideline

By overall diameter alone, 265/35R22 falls inside the ±3% range commonly used as a guideline when replacing 285/40R20. 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.

285/40R20 vs 265/35R22 differences
Measurement	285/40R20	265/35R22	Difference	% diff
Overall diameter	28.98 in (736.0 mm)	29.30 in (744.3 mm)	+0.33 in (+8.3 mm)	+1.13%
Sidewall height	4.49 in (114.0 mm)	3.65 in (92.8 mm)	−0.84 in (−21.2 mm)	−18.64%
Section width	11.22 in (285.0 mm)	10.43 in (265.0 mm)	−0.79 in (−20.0 mm)	−7.02%
Circumference	91.03 in (2,312.2 mm)	92.06 in (2,338.3 mm)	+1.03 in (+26.1 mm)	+1.13%
Revolutions per mile	696	688	−8	−1.12%

True speed with the speedometer calibrated for 285/40R20
Indicated	Actual on 285/40R20	Actual on 265/35R22	Difference
30 mph	30.0 mph	30.3 mph	+0.3 mph
60 mph	60.0 mph	60.7 mph	+0.7 mph
75 mph	75.0 mph	75.8 mph	+0.8 mph

Ride-height change: 265/35R22 raises the vehicle by 0.16 in (4.1 mm) at the axle (half the +8.3 mm diameter difference).

265/35R22 is 0.33 in taller than 285/40R20 and 20 mm narrower, a 1.13% difference in overall diameter.

With the speedometer calibrated for 285/40R20, an indicated 60 mph is actually 60.7 mph on 265/35R22, and revolutions per mile change from 696 to 688.

265/35R22 mounts on a 22-inch wheel, a plus-2 fitment from the 20-inch wheel of 285/40R20.

Size pages

Other comparisons with 285/40R20

Other comparisons with 265/35R22

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