255/40R20 vs 295/25R22

295/25R22 is 0.22 in (5.7 mm) shorter than 255/40R20, a −0.80% diameter difference. With the speedometer set for 255/40R20, an indicated 60 mph is 59.5 mph on 295/25R22.

Is this a safe swap?

Diameter difference −0.80%: under 1%

By overall diameter alone, 295/25R22 is a near match for 255/40R20; 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.

255/40R20 vs 295/25R22 differences
Measurement	255/40R20	295/25R22	Difference	% diff
Overall diameter	28.03 in (712.0 mm)	27.81 in (706.3 mm)	−0.22 in (−5.7 mm)	−0.80%
Sidewall height	4.02 in (102.0 mm)	2.90 in (73.8 mm)	−1.11 in (−28.2 mm)	−27.70%
Section width	10.04 in (255.0 mm)	11.61 in (295.0 mm)	+1.57 in (+40.0 mm)	+15.69%
Circumference	88.06 in (2,236.8 mm)	87.36 in (2,218.9 mm)	−0.71 in (−17.9 mm)	−0.80%
Revolutions per mile	719	725	+6	+0.81%

True speed with the speedometer calibrated for 255/40R20
Indicated	Actual on 255/40R20	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 (2.9 mm) at the axle (half the −5.7 mm diameter difference).

295/25R22 is 0.22 in shorter than 255/40R20 and 40 mm wider, a 0.80% difference in overall diameter.

With the speedometer calibrated for 255/40R20, an indicated 60 mph is actually 59.5 mph on 295/25R22, and revolutions per mile change from 719 to 725.

295/25R22 mounts on a 22-inch wheel, a plus-2 fitment from the 20-inch wheel of 255/40R20.

Size pages

Other comparisons with 255/40R20

Other comparisons with 295/25R22

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