TireSizesFinder

285/60R20 vs 325/45R22

325/45R22 is 0.05 in (1.3 mm) taller than 285/60R20, a +0.15% diameter difference. With the speedometer set for 285/60R20, an indicated 60 mph is 60.1 mph on 325/45R22.

Is this a safe swap?

Diameter difference +0.15%: under 1%

By overall diameter alone, 325/45R22 is a near match for 285/60R20; 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: 285/60R20 (33.46 in) vs 325/45R22 (33.52 in)285/60R2033.46 in × 11.22 in325/45R2233.52 in × 12.80 in
Side profile and tread width, drawn to the same scale.
285/60R20 vs 325/45R22 differences
Measurement285/60R20325/45R22Difference% diff
Overall diameter33.46 in (850.0 mm)33.52 in (851.3 mm)+0.05 in (+1.3 mm)+0.15%
Sidewall height6.73 in (171.0 mm)5.76 in (146.3 mm)−0.97 in (−24.7 mm)−14.47%
Section width11.22 in (285.0 mm)12.80 in (325.0 mm)+1.57 in (+40.0 mm)+14.04%
Circumference105.13 in (2,670.4 mm)105.29 in (2,674.4 mm)+0.16 in (+4.1 mm)+0.15%
Revolutions per mile603602−1−0.15%
True speed with the speedometer calibrated for 285/60R20
IndicatedActual on 285/60R20Actual on 325/45R22Difference
30 mph30.0 mph30.0 mph0.0 mph
60 mph60.0 mph60.1 mph+0.1 mph
75 mph75.0 mph75.1 mph+0.1 mph

Ride-height change: 325/45R22 raises the vehicle by 0.03 in (0.6 mm) at the axle (half the +1.3 mm diameter difference).

325/45R22 is 0.05 in taller than 285/60R20 and 40 mm wider, a 0.15% difference in overall diameter.

With the speedometer calibrated for 285/60R20, an indicated 60 mph is actually 60.1 mph on 325/45R22, and revolutions per mile change from 603 to 602.

325/45R22 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 325/45R22

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