265/35R21 vs 265/30R22

265/30R22 is 0.04 in (1.1 mm) shorter than 265/35R21, a −0.15% diameter difference. With the speedometer set for 265/35R21, an indicated 60 mph is 59.9 mph on 265/30R22.

Is this a safe swap?

Diameter difference −0.15%: under 1%

By overall diameter alone, 265/30R22 is a near match for 265/35R21; 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.

265/35R21 vs 265/30R22 differences
Measurement	265/35R21	265/30R22	Difference	% diff
Overall diameter	28.30 in (718.9 mm)	28.26 in (717.8 mm)	−0.04 in (−1.1 mm)	−0.15%
Sidewall height	3.65 in (92.8 mm)	3.13 in (79.5 mm)	−0.52 in (−13.2 mm)	−14.29%
Section width	10.43 in (265.0 mm)	10.43 in (265.0 mm)	0.00 in (0.0 mm)	0.00%
Circumference	88.92 in (2,258.5 mm)	88.78 in (2,255.0 mm)	−0.14 in (−3.5 mm)	−0.15%
Revolutions per mile	713	714	+1	+0.15%

True speed with the speedometer calibrated for 265/35R21
Indicated	Actual on 265/35R21	Actual on 265/30R22	Difference
30 mph	30.0 mph	30.0 mph	0.0 mph
60 mph	60.0 mph	59.9 mph	−0.1 mph
75 mph	75.0 mph	74.9 mph	−0.1 mph

Ride-height change: 265/30R22 lowers the vehicle by 0.02 in (0.6 mm) at the axle (half the −1.1 mm diameter difference).

265/30R22 is 0.04 in shorter than 265/35R21 and the same width, a 0.15% difference in overall diameter.

With the speedometer calibrated for 265/35R21, an indicated 60 mph is actually 59.9 mph on 265/30R22, and revolutions per mile change from 713 to 714.

265/30R22 mounts on a 22-inch wheel, a plus-1 fitment from the 21-inch wheel of 265/35R21.

Size pages

Other comparisons with 265/35R21

Other comparisons with 265/30R22

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