285/60R20 vs 33x12.50R22

33x12.50R22 is 0.46 in (11.8 mm) shorter than 285/60R20, a −1.39% diameter difference. With the speedometer set for 285/60R20, an indicated 60 mph is 59.2 mph on 33x12.50R22.

Is this a safe swap?

Diameter difference −1.39%: within the ±3% guideline

By overall diameter alone, 33x12.50R22 falls inside the ±3% range commonly used as a guideline when replacing 285/60R20. 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.

285/60R20 vs 33x12.50R22 differences
Measurement	285/60R20	33x12.50R22	Difference	% diff
Overall diameter	33.46 in (850.0 mm)	33.00 in (838.2 mm)	−0.46 in (−11.8 mm)	−1.39%
Sidewall height	6.73 in (171.0 mm)	5.50 in (139.7 mm)	−1.23 in (−31.3 mm)	−18.30%
Section width	11.22 in (285.0 mm)	12.50 in (317.5 mm)	+1.28 in (+32.5 mm)	+11.40%
Circumference	105.13 in (2,670.4 mm)	103.67 in (2,633.3 mm)	−1.46 in (−37.1 mm)	−1.39%
Revolutions per mile	603	611	+8	+1.41%

True speed with the speedometer calibrated for 285/60R20
Indicated	Actual on 285/60R20	Actual on 33x12.50R22	Difference
30 mph	30.0 mph	29.6 mph	−0.4 mph
60 mph	60.0 mph	59.2 mph	−0.8 mph
75 mph	75.0 mph	74.0 mph	−1.0 mph

Ride-height change: 33x12.50R22 lowers the vehicle by 0.23 in (5.9 mm) at the axle (half the −11.8 mm diameter difference).

33x12.50R22 is 0.46 in shorter than 285/60R20 and 33 mm wider, a 1.39% difference in overall diameter.

With the speedometer calibrated for 285/60R20, an indicated 60 mph is actually 59.2 mph on 33x12.50R22, and revolutions per mile change from 603 to 611.

33x12.50R22 mounts on a 22-inch wheel, a plus-2 fitment from the 20-inch wheel of 285/60R20.

Size pages

Other comparisons with 285/60R20

Other comparisons with 33x12.50R22

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