265/35R22 vs 315/30R22

315/30R22 is 0.14 in (3.5 mm) taller than 265/35R22, a +0.47% diameter difference. With the speedometer set for 265/35R22, an indicated 60 mph is 60.3 mph on 315/30R22.

Is this a safe swap?

Diameter difference +0.47%: under 1%

By overall diameter alone, 315/30R22 is a near match for 265/35R22; the speedometer changes by less than 1%. 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.

265/35R22 vs 315/30R22 differences
Measurement	265/35R22	315/30R22	Difference	% diff
Overall diameter	29.30 in (744.3 mm)	29.44 in (747.8 mm)	+0.14 in (+3.5 mm)	+0.47%
Sidewall height	3.65 in (92.8 mm)	3.72 in (94.5 mm)	+0.07 in (+1.8 mm)	+1.89%
Section width	10.43 in (265.0 mm)	12.40 in (315.0 mm)	+1.97 in (+50.0 mm)	+18.87%
Circumference	92.06 in (2,338.3 mm)	92.49 in (2,349.3 mm)	+0.43 in (+11.0 mm)	+0.47%
Revolutions per mile	688	685	−3	−0.47%

True speed with the speedometer calibrated for 265/35R22
Indicated	Actual on 265/35R22	Actual on 315/30R22	Difference
30 mph	30.0 mph	30.1 mph	+0.1 mph
60 mph	60.0 mph	60.3 mph	+0.3 mph
75 mph	75.0 mph	75.4 mph	+0.4 mph

Ride-height change: 315/30R22 raises the vehicle by 0.07 in (1.8 mm) at the axle (half the +3.5 mm diameter difference).

315/30R22 is 0.14 in taller than 265/35R22 and 50 mm wider, a 0.47% difference in overall diameter.

With the speedometer calibrated for 265/35R22, an indicated 60 mph is actually 60.3 mph on 315/30R22, and revolutions per mile change from 688 to 685.

Both sizes mount on 22-inch wheels.

Size pages

Other comparisons with 265/35R22

Other comparisons with 315/30R22

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