265/40R22 vs 305/35R22

305/35R22 is 0.06 in (1.5 mm) taller than 265/40R22, a +0.19% diameter difference. With the speedometer set for 265/40R22, an indicated 60 mph is 60.1 mph on 305/35R22.

Is this a safe swap?

Diameter difference +0.19%: under 1%

By overall diameter alone, 305/35R22 is a near match for 265/40R22; 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.

265/40R22 vs 305/35R22 differences
Measurement	265/40R22	305/35R22	Difference	% diff
Overall diameter	30.35 in (770.8 mm)	30.41 in (772.3 mm)	+0.06 in (+1.5 mm)	+0.19%
Sidewall height	4.17 in (106.0 mm)	4.20 in (106.8 mm)	+0.03 in (+0.8 mm)	+0.71%
Section width	10.43 in (265.0 mm)	12.01 in (305.0 mm)	+1.57 in (+40.0 mm)	+15.09%
Circumference	95.34 in (2,421.5 mm)	95.52 in (2,426.3 mm)	+0.19 in (+4.7 mm)	+0.19%
Revolutions per mile	665	663	−1	−0.19%

True speed with the speedometer calibrated for 265/40R22
Indicated	Actual on 265/40R22	Actual on 305/35R22	Difference
30 mph	30.0 mph	30.1 mph	+0.1 mph
60 mph	60.0 mph	60.1 mph	+0.1 mph
75 mph	75.0 mph	75.1 mph	+0.1 mph

Ride-height change: 305/35R22 raises the vehicle by 0.03 in (0.8 mm) at the axle (half the +1.5 mm diameter difference).

305/35R22 is 0.06 in taller than 265/40R22 and 40 mm wider, a 0.19% difference in overall diameter.

With the speedometer calibrated for 265/40R22, an indicated 60 mph is actually 60.1 mph on 305/35R22, and revolutions per mile change from 665 to 663.

Both sizes mount on 22-inch wheels.

Size pages

Other comparisons with 265/40R22

Other comparisons with 305/35R22

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