285/30R22 vs 255/35R22

255/35R22 is 0.30 in (7.5 mm) taller than 285/30R22, a +1.03% diameter difference. With the speedometer set for 285/30R22, an indicated 60 mph is 60.6 mph on 255/35R22.

Is this a safe swap?

Diameter difference +1.03%: within the ±3% guideline

By overall diameter alone, 255/35R22 falls inside the ±3% range commonly used as a guideline when replacing 285/30R22. 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.

285/30R22 vs 255/35R22 differences
Measurement	285/30R22	255/35R22	Difference	% diff
Overall diameter	28.73 in (729.8 mm)	29.03 in (737.3 mm)	+0.30 in (+7.5 mm)	+1.03%
Sidewall height	3.37 in (85.5 mm)	3.51 in (89.3 mm)	+0.15 in (+3.8 mm)	+4.39%
Section width	11.22 in (285.0 mm)	10.04 in (255.0 mm)	−1.18 in (−30.0 mm)	−10.53%
Circumference	90.27 in (2,292.7 mm)	91.19 in (2,316.3 mm)	+0.93 in (+23.6 mm)	+1.03%
Revolutions per mile	702	695	−7	−1.02%

True speed with the speedometer calibrated for 285/30R22
Indicated	Actual on 285/30R22	Actual on 255/35R22	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	75.8 mph	+0.8 mph

Ride-height change: 255/35R22 raises the vehicle by 0.15 in (3.8 mm) at the axle (half the +7.5 mm diameter difference).

255/35R22 is 0.30 in taller than 285/30R22 and 30 mm narrower, a 1.03% difference in overall diameter.

With the speedometer calibrated for 285/30R22, an indicated 60 mph is actually 60.6 mph on 255/35R22, and revolutions per mile change from 702 to 695.

Both sizes mount on 22-inch wheels.

Size pages

Other comparisons with 285/30R22

Other comparisons with 255/35R22

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