TireSizesFinder

285/45R20 vs 285/35R22

285/35R22 is 0.24 in (6.2 mm) shorter than 285/45R20, a −0.81% diameter difference. With the speedometer set for 285/45R20, an indicated 60 mph is 59.5 mph on 285/35R22.

Is this a safe swap?

Diameter difference −0.81%: under 1%

By overall diameter alone, 285/35R22 is a near match for 285/45R20; the speedometer changes by less than 1%. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 285/45R20 (30.10 in) vs 285/35R22 (29.85 in)285/45R2030.10 in × 11.22 in285/35R2229.85 in × 11.22 in
Side profile and tread width, drawn to the same scale.
285/45R20 vs 285/35R22 differences
Measurement285/45R20285/35R22Difference% diff
Overall diameter30.10 in (764.5 mm)29.85 in (758.3 mm)−0.24 in (−6.2 mm)−0.81%
Sidewall height5.05 in (128.3 mm)3.93 in (99.8 mm)−1.12 in (−28.5 mm)−22.22%
Section width11.22 in (285.0 mm)11.22 in (285.0 mm)0.00 in (0.0 mm)0.00%
Circumference94.56 in (2,401.7 mm)93.79 in (2,382.3 mm)−0.77 in (−19.5 mm)−0.81%
Revolutions per mile670676+5+0.82%
True speed with the speedometer calibrated for 285/45R20
IndicatedActual on 285/45R20Actual on 285/35R22Difference
30 mph30.0 mph29.8 mph−0.2 mph
60 mph60.0 mph59.5 mph−0.5 mph
75 mph75.0 mph74.4 mph−0.6 mph

Ride-height change: 285/35R22 lowers the vehicle by 0.12 in (3.1 mm) at the axle (half the −6.2 mm diameter difference).

285/35R22 is 0.24 in shorter than 285/45R20 and the same width, a 0.81% difference in overall diameter.

With the speedometer calibrated for 285/45R20, an indicated 60 mph is actually 59.5 mph on 285/35R22, and revolutions per mile change from 670 to 676.

285/35R22 mounts on a 22-inch wheel, a plus-2 fitment from the 20-inch wheel of 285/45R20.

Size pages

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Source: Calculated from standard tire geometry formulas. Verified . How these numbers are calculated.