295/25R22 vs 255/30R22

255/30R22 is 0.22 in (5.5 mm) taller than 295/25R22, a +0.78% diameter difference. With the speedometer set for 295/25R22, an indicated 60 mph is 60.5 mph on 255/30R22.

Is this a safe swap?

Diameter difference +0.78%: under 1%

By overall diameter alone, 255/30R22 is a near match for 295/25R22; 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.

295/25R22 vs 255/30R22 differences
Measurement	295/25R22	255/30R22	Difference	% diff
Overall diameter	27.81 in (706.3 mm)	28.02 in (711.8 mm)	+0.22 in (+5.5 mm)	+0.78%
Sidewall height	2.90 in (73.8 mm)	3.01 in (76.5 mm)	+0.11 in (+2.8 mm)	+3.73%
Section width	11.61 in (295.0 mm)	10.04 in (255.0 mm)	−1.57 in (−40.0 mm)	−13.56%
Circumference	87.36 in (2,218.9 mm)	88.04 in (2,236.2 mm)	+0.68 in (+17.3 mm)	+0.78%
Revolutions per mile	725	720	−6	−0.77%

True speed with the speedometer calibrated for 295/25R22
Indicated	Actual on 295/25R22	Actual on 255/30R22	Difference
30 mph	30.0 mph	30.2 mph	+0.2 mph
60 mph	60.0 mph	60.5 mph	+0.5 mph
75 mph	75.0 mph	75.6 mph	+0.6 mph

Ride-height change: 255/30R22 raises the vehicle by 0.11 in (2.8 mm) at the axle (half the +5.5 mm diameter difference).

255/30R22 is 0.22 in taller than 295/25R22 and 40 mm narrower, a 0.78% difference in overall diameter.

With the speedometer calibrated for 295/25R22, an indicated 60 mph is actually 60.5 mph on 255/30R22, and revolutions per mile change from 725 to 720.

Both sizes mount on 22-inch wheels.

Size pages

Other comparisons with 295/25R22

Other comparisons with 255/30R22

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