33x12.50R20 vs 285/50R22

285/50R22 is 0.22 in (5.6 mm) taller than 33x12.50R20, a +0.67% diameter difference. With the speedometer set for 33x12.50R20, an indicated 60 mph is 60.4 mph on 285/50R22.

Is this a safe swap?

Diameter difference +0.67%: under 1%

By overall diameter alone, 285/50R22 is a near match for 33x12.50R20; 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.

33x12.50R20 vs 285/50R22 differences
Measurement	33x12.50R20	285/50R22	Difference	% diff
Overall diameter	33.00 in (838.2 mm)	33.22 in (843.8 mm)	+0.22 in (+5.6 mm)	+0.67%
Sidewall height	6.50 in (165.1 mm)	5.61 in (142.5 mm)	−0.89 in (−22.6 mm)	−13.69%
Section width	12.50 in (317.5 mm)	11.22 in (285.0 mm)	−1.28 in (−32.5 mm)	−10.24%
Circumference	103.67 in (2,633.3 mm)	104.37 in (2,650.9 mm)	+0.69 in (+17.6 mm)	+0.67%
Revolutions per mile	611	607	−4	−0.66%

True speed with the speedometer calibrated for 33x12.50R20
Indicated	Actual on 33x12.50R20	Actual on 285/50R22	Difference
30 mph	30.0 mph	30.2 mph	+0.2 mph
60 mph	60.0 mph	60.4 mph	+0.4 mph
75 mph	75.0 mph	75.5 mph	+0.5 mph

Ride-height change: 285/50R22 raises the vehicle by 0.11 in (2.8 mm) at the axle (half the +5.6 mm diameter difference).

285/50R22 is 0.22 in taller than 33x12.50R20 and 33 mm narrower, a 0.67% difference in overall diameter.

With the speedometer calibrated for 33x12.50R20, an indicated 60 mph is actually 60.4 mph on 285/50R22, and revolutions per mile change from 611 to 607.

285/50R22 mounts on a 22-inch wheel, a plus-2 fitment from the 20-inch wheel of 33x12.50R20.

Size pages

Other comparisons with 33x12.50R20

Other comparisons with 285/50R22

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