315/30R22 vs 285/35R22

285/35R22 is 0.41 in (10.5 mm) taller than 315/30R22, a +1.40% diameter difference. With the speedometer set for 315/30R22, an indicated 60 mph is 60.8 mph on 285/35R22.

Is this a safe swap?

Diameter difference +1.40%: within the ±3% guideline

By overall diameter alone, 285/35R22 falls inside the ±3% range commonly used as a guideline when replacing 315/30R22. 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.

315/30R22 vs 285/35R22 differences
Measurement	315/30R22	285/35R22	Difference	% diff
Overall diameter	29.44 in (747.8 mm)	29.85 in (758.3 mm)	+0.41 in (+10.5 mm)	+1.40%
Sidewall height	3.72 in (94.5 mm)	3.93 in (99.8 mm)	+0.21 in (+5.3 mm)	+5.56%
Section width	12.40 in (315.0 mm)	11.22 in (285.0 mm)	−1.18 in (−30.0 mm)	−9.52%
Circumference	92.49 in (2,349.3 mm)	93.79 in (2,382.3 mm)	+1.30 in (+33.0 mm)	+1.40%
Revolutions per mile	685	676	−9	−1.38%

True speed with the speedometer calibrated for 315/30R22
Indicated	Actual on 315/30R22	Actual on 285/35R22	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	76.1 mph	+1.1 mph

Ride-height change: 285/35R22 raises the vehicle by 0.21 in (5.3 mm) at the axle (half the +10.5 mm diameter difference).

285/35R22 is 0.41 in taller than 315/30R22 and 30 mm narrower, a 1.40% difference in overall diameter.

With the speedometer calibrated for 315/30R22, an indicated 60 mph is actually 60.8 mph on 285/35R22, and revolutions per mile change from 685 to 676.

Both sizes mount on 22-inch wheels.

Size pages

Other comparisons with 315/30R22

Other comparisons with 285/35R22

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