275/50R21 vs 295/40R22

295/40R22 is 0.54 in (13.6 mm) shorter than 275/50R21, a −1.68% diameter difference. With the speedometer set for 275/50R21, an indicated 60 mph is 59.0 mph on 295/40R22.

Is this a safe swap?

Diameter difference −1.68%: within the ±3% guideline

By overall diameter alone, 295/40R22 falls inside the ±3% range commonly used as a guideline when replacing 275/50R21. 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.

275/50R21 vs 295/40R22 differences
Measurement	275/50R21	295/40R22	Difference	% diff
Overall diameter	31.83 in (808.4 mm)	31.29 in (794.8 mm)	−0.54 in (−13.6 mm)	−1.68%
Sidewall height	5.41 in (137.5 mm)	4.65 in (118.0 mm)	−0.77 in (−19.5 mm)	−14.18%
Section width	10.83 in (275.0 mm)	11.61 in (295.0 mm)	+0.79 in (+20.0 mm)	+7.27%
Circumference	99.99 in (2,539.7 mm)	98.30 in (2,496.9 mm)	−1.68 in (−42.7 mm)	−1.68%
Revolutions per mile	634	645	+11	+1.71%

True speed with the speedometer calibrated for 275/50R21
Indicated	Actual on 275/50R21	Actual on 295/40R22	Difference
30 mph	30.0 mph	29.5 mph	−0.5 mph
60 mph	60.0 mph	59.0 mph	−1.0 mph
75 mph	75.0 mph	73.7 mph	−1.3 mph

Ride-height change: 295/40R22 lowers the vehicle by 0.27 in (6.8 mm) at the axle (half the −13.6 mm diameter difference).

295/40R22 is 0.54 in shorter than 275/50R21 and 20 mm wider, a 1.68% difference in overall diameter.

With the speedometer calibrated for 275/50R21, an indicated 60 mph is actually 59.0 mph on 295/40R22, and revolutions per mile change from 634 to 645.

295/40R22 mounts on a 22-inch wheel, a plus-1 fitment from the 21-inch wheel of 275/50R21.

Size pages

Other comparisons with 275/50R21

Other comparisons with 295/40R22

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