265/40R22 vs 285/40R22

285/40R22 is 0.63 in (16.0 mm) taller than 265/40R22, a +2.08% diameter difference. With the speedometer set for 265/40R22, an indicated 60 mph is 61.2 mph on 285/40R22.

Is this a safe swap?

Diameter difference +2.08%: within the ±3% guideline

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

265/40R22 vs 285/40R22 differences
Measurement	265/40R22	285/40R22	Difference	% diff
Overall diameter	30.35 in (770.8 mm)	30.98 in (786.8 mm)	+0.63 in (+16.0 mm)	+2.08%
Sidewall height	4.17 in (106.0 mm)	4.49 in (114.0 mm)	+0.31 in (+8.0 mm)	+7.55%
Section width	10.43 in (265.0 mm)	11.22 in (285.0 mm)	+0.79 in (+20.0 mm)	+7.55%
Circumference	95.34 in (2,421.5 mm)	97.32 in (2,471.8 mm)	+1.98 in (+50.3 mm)	+2.08%
Revolutions per mile	665	651	−14	−2.03%

True speed with the speedometer calibrated for 265/40R22
Indicated	Actual on 265/40R22	Actual on 285/40R22	Difference
30 mph	30.0 mph	30.6 mph	+0.6 mph
60 mph	60.0 mph	61.2 mph	+1.2 mph
75 mph	75.0 mph	76.6 mph	+1.6 mph

Ride-height change: 285/40R22 raises the vehicle by 0.31 in (8.0 mm) at the axle (half the +16.0 mm diameter difference).

285/40R22 is 0.63 in taller than 265/40R22 and 20 mm wider, a 2.08% difference in overall diameter.

With the speedometer calibrated for 265/40R22, an indicated 60 mph is actually 61.2 mph on 285/40R22, and revolutions per mile change from 665 to 651.

Both sizes mount on 22-inch wheels.

Size pages

Other comparisons with 265/40R22

Other comparisons with 285/40R22

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