285/35R22 vs 285/30R24

285/30R24 is 0.88 in (22.3 mm) taller than 285/35R22, a +2.94% diameter difference. With the speedometer set for 285/35R22, an indicated 60 mph is 61.8 mph on 285/30R24.

Is this a safe swap?

Diameter difference +2.94%: within the ±3% guideline

By overall diameter alone, 285/30R24 falls inside the ±3% range commonly used as a guideline when replacing 285/35R22. 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.

285/35R22 vs 285/30R24 differences
Measurement	285/35R22	285/30R24	Difference	% diff
Overall diameter	29.85 in (758.3 mm)	30.73 in (780.6 mm)	+0.88 in (+22.3 mm)	+2.94%
Sidewall height	3.93 in (99.8 mm)	3.37 in (85.5 mm)	−0.56 in (−14.2 mm)	−14.29%
Section width	11.22 in (285.0 mm)	11.22 in (285.0 mm)	0.00 in (0.0 mm)	0.00%
Circumference	93.79 in (2,382.3 mm)	96.55 in (2,452.3 mm)	+2.76 in (+70.1 mm)	+2.94%
Revolutions per mile	676	656	−19	−2.86%

True speed with the speedometer calibrated for 285/35R22
Indicated	Actual on 285/35R22	Actual on 285/30R24	Difference
30 mph	30.0 mph	30.9 mph	+0.9 mph
60 mph	60.0 mph	61.8 mph	+1.8 mph
75 mph	75.0 mph	77.2 mph	+2.2 mph

Ride-height change: 285/30R24 raises the vehicle by 0.44 in (11.1 mm) at the axle (half the +22.3 mm diameter difference).

285/30R24 is 0.88 in taller than 285/35R22 and the same width, a 2.94% difference in overall diameter.

With the speedometer calibrated for 285/35R22, an indicated 60 mph is actually 61.8 mph on 285/30R24, and revolutions per mile change from 676 to 656.

285/30R24 mounts on a 24-inch wheel, a plus-2 fitment from the 22-inch wheel of 285/35R22.

Size pages

Other comparisons with 285/35R22

Other comparisons with 285/30R24

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