265/50R21 vs 275/45R22

275/45R22 is 0.31 in (7.9 mm) taller than 265/50R21, a +0.99% diameter difference. With the speedometer set for 265/50R21, an indicated 60 mph is 60.6 mph on 275/45R22.

Is this a safe swap?

Diameter difference +0.99%: under 1%

By overall diameter alone, 275/45R22 is a near match for 265/50R21; 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.

265/50R21 vs 275/45R22 differences
Measurement	265/50R21	275/45R22	Difference	% diff
Overall diameter	31.43 in (798.4 mm)	31.74 in (806.3 mm)	+0.31 in (+7.9 mm)	+0.99%
Sidewall height	5.22 in (132.5 mm)	4.87 in (123.8 mm)	−0.34 in (−8.7 mm)	−6.60%
Section width	10.43 in (265.0 mm)	10.83 in (275.0 mm)	+0.39 in (+10.0 mm)	+3.77%
Circumference	98.75 in (2,508.2 mm)	99.73 in (2,533.1 mm)	+0.98 in (+24.8 mm)	+0.99%
Revolutions per mile	642	635	−6	−0.98%

True speed with the speedometer calibrated for 265/50R21
Indicated	Actual on 265/50R21	Actual on 275/45R22	Difference
30 mph	30.0 mph	30.3 mph	+0.3 mph
60 mph	60.0 mph	60.6 mph	+0.6 mph
75 mph	75.0 mph	75.7 mph	+0.7 mph

Ride-height change: 275/45R22 raises the vehicle by 0.16 in (3.9 mm) at the axle (half the +7.9 mm diameter difference).

275/45R22 is 0.31 in taller than 265/50R21 and 10 mm wider, a 0.99% difference in overall diameter.

With the speedometer calibrated for 265/50R21, an indicated 60 mph is actually 60.6 mph on 275/45R22, and revolutions per mile change from 642 to 635.

275/45R22 mounts on a 22-inch wheel, a plus-1 fitment from the 21-inch wheel of 265/50R21.

Size pages

Other comparisons with 265/50R21

Other comparisons with 275/45R22

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