255/35R21 vs 295/25R22

295/25R22 is 0.22 in (5.6 mm) shorter than 255/35R21, a −0.79% diameter difference. With the speedometer set for 255/35R21, an indicated 60 mph is 59.5 mph on 295/25R22.

Is this a safe swap?

Diameter difference −0.79%: under 1%

By overall diameter alone, 295/25R22 is a near match for 255/35R21; 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.

255/35R21 vs 295/25R22 differences
Measurement	255/35R21	295/25R22	Difference	% diff
Overall diameter	28.03 in (711.9 mm)	27.81 in (706.3 mm)	−0.22 in (−5.6 mm)	−0.79%
Sidewall height	3.51 in (89.3 mm)	2.90 in (73.8 mm)	−0.61 in (−15.5 mm)	−17.37%
Section width	10.04 in (255.0 mm)	11.61 in (295.0 mm)	+1.57 in (+40.0 mm)	+15.69%
Circumference	88.05 in (2,236.5 mm)	87.36 in (2,218.9 mm)	−0.69 in (−17.6 mm)	−0.79%
Revolutions per mile	720	725	+6	+0.79%

True speed with the speedometer calibrated for 255/35R21
Indicated	Actual on 255/35R21	Actual on 295/25R22	Difference
30 mph	30.0 mph	29.8 mph	−0.2 mph
60 mph	60.0 mph	59.5 mph	−0.5 mph
75 mph	75.0 mph	74.4 mph	−0.6 mph

Ride-height change: 295/25R22 lowers the vehicle by 0.11 in (2.8 mm) at the axle (half the −5.6 mm diameter difference).

295/25R22 is 0.22 in shorter than 255/35R21 and 40 mm wider, a 0.79% difference in overall diameter.

With the speedometer calibrated for 255/35R21, an indicated 60 mph is actually 59.5 mph on 295/25R22, and revolutions per mile change from 720 to 725.

295/25R22 mounts on a 22-inch wheel, a plus-1 fitment from the 21-inch wheel of 255/35R21.

Size pages

Other comparisons with 255/35R21

Other comparisons with 295/25R22

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