TireSizesFinder

325/60R20 vs 325/50R22

325/50R22 is 0.56 in (14.2 mm) shorter than 325/60R20, a −1.58% diameter difference. With the speedometer set for 325/60R20, an indicated 60 mph is 59.1 mph on 325/50R22.

Is this a safe swap?

Diameter difference −1.58%: within the ±3% guideline

By overall diameter alone, 325/50R22 falls inside the ±3% range commonly used as a guideline when replacing 325/60R20. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 325/60R20 (35.35 in) vs 325/50R22 (34.80 in)325/60R2035.35 in × 12.80 in325/50R2234.80 in × 12.80 in
Side profile and tread width, drawn to the same scale.
325/60R20 vs 325/50R22 differences
Measurement325/60R20325/50R22Difference% diff
Overall diameter35.35 in (898.0 mm)34.80 in (883.8 mm)−0.56 in (−14.2 mm)−1.58%
Sidewall height7.68 in (195.0 mm)6.40 in (162.5 mm)−1.28 in (−32.5 mm)−16.67%
Section width12.80 in (325.0 mm)12.80 in (325.0 mm)0.00 in (0.0 mm)0.00%
Circumference111.07 in (2,821.2 mm)109.31 in (2,776.5 mm)−1.76 in (−44.6 mm)−1.58%
Revolutions per mile570580+9+1.61%
True speed with the speedometer calibrated for 325/60R20
IndicatedActual on 325/60R20Actual on 325/50R22Difference
30 mph30.0 mph29.5 mph−0.5 mph
60 mph60.0 mph59.1 mph−0.9 mph
75 mph75.0 mph73.8 mph−1.2 mph

Ride-height change: 325/50R22 lowers the vehicle by 0.28 in (7.1 mm) at the axle (half the −14.2 mm diameter difference).

325/50R22 is 0.56 in shorter than 325/60R20 and the same width, a 1.58% difference in overall diameter.

With the speedometer calibrated for 325/60R20, an indicated 60 mph is actually 59.1 mph on 325/50R22, and revolutions per mile change from 570 to 580.

325/50R22 mounts on a 22-inch wheel, a plus-2 fitment from the 20-inch wheel of 325/60R20.

Size pages

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