275/35R21 vs 265/30R22

265/30R22 is 0.32 in (8.1 mm) shorter than 275/35R21, a −1.12% diameter difference. With the speedometer set for 275/35R21, an indicated 60 mph is 59.3 mph on 265/30R22.

Is this a safe swap?

Diameter difference −1.12%: within the ±3% guideline

By overall diameter alone, 265/30R22 falls inside the ±3% range commonly used as a guideline when replacing 275/35R21. 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.

275/35R21 vs 265/30R22 differences
Measurement	275/35R21	265/30R22	Difference	% diff
Overall diameter	28.58 in (725.9 mm)	28.26 in (717.8 mm)	−0.32 in (−8.1 mm)	−1.12%
Sidewall height	3.79 in (96.3 mm)	3.13 in (79.5 mm)	−0.66 in (−16.7 mm)	−17.40%
Section width	10.83 in (275.0 mm)	10.43 in (265.0 mm)	−0.39 in (−10.0 mm)	−3.64%
Circumference	89.78 in (2,280.5 mm)	88.78 in (2,255.0 mm)	−1.00 in (−25.4 mm)	−1.12%
Revolutions per mile	706	714	+8	+1.13%

True speed with the speedometer calibrated for 275/35R21
Indicated	Actual on 275/35R21	Actual on 265/30R22	Difference
30 mph	30.0 mph	29.7 mph	−0.3 mph
60 mph	60.0 mph	59.3 mph	−0.7 mph
75 mph	75.0 mph	74.2 mph	−0.8 mph

Ride-height change: 265/30R22 lowers the vehicle by 0.16 in (4.1 mm) at the axle (half the −8.1 mm diameter difference).

265/30R22 is 0.32 in shorter than 275/35R21 and 10 mm narrower, a 1.12% difference in overall diameter.

With the speedometer calibrated for 275/35R21, an indicated 60 mph is actually 59.3 mph on 265/30R22, and revolutions per mile change from 706 to 714.

265/30R22 mounts on a 22-inch wheel, a plus-1 fitment from the 21-inch wheel of 275/35R21.

Size pages

Other comparisons with 275/35R21

Other comparisons with 265/30R22

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