265/40R22 vs 285/30R24

285/30R24 is 0.39 in (9.8 mm) taller than 265/40R22, a +1.27% diameter difference. With the speedometer set for 265/40R22, an indicated 60 mph is 60.8 mph on 285/30R24.

Is this a safe swap?

Diameter difference +1.27%: within the ±3% guideline

By overall diameter alone, 285/30R24 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 285/30R24 differences
Measurement	265/40R22	285/30R24	Difference	% diff
Overall diameter	30.35 in (770.8 mm)	30.73 in (780.6 mm)	+0.39 in (+9.8 mm)	+1.27%
Sidewall height	4.17 in (106.0 mm)	3.37 in (85.5 mm)	−0.81 in (−20.5 mm)	−19.34%
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)	96.55 in (2,452.3 mm)	+1.21 in (+30.8 mm)	+1.27%
Revolutions per mile	665	656	−8	−1.26%

True speed with the speedometer calibrated for 265/40R22
Indicated	Actual on 265/40R22	Actual on 285/30R24	Difference
30 mph	30.0 mph	30.4 mph	+0.4 mph
60 mph	60.0 mph	60.8 mph	+0.8 mph
75 mph	75.0 mph	76.0 mph	+1.0 mph

Ride-height change: 285/30R24 raises the vehicle by 0.19 in (4.9 mm) at the axle (half the +9.8 mm diameter difference).

285/30R24 is 0.39 in taller than 265/40R22 and 20 mm wider, a 1.27% difference in overall diameter.

With the speedometer calibrated for 265/40R22, an indicated 60 mph is actually 60.8 mph on 285/30R24, and revolutions per mile change from 665 to 656.

285/30R24 mounts on a 24-inch wheel, a plus-2 fitment from the 22-inch wheel of 265/40R22.

Size pages

Other comparisons with 265/40R22

Other comparisons with 285/30R24

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