275/65R20 vs 325/50R22

325/50R22 is 0.72 in (18.3 mm) taller than 275/65R20, a +2.11% diameter difference. With the speedometer set for 275/65R20, an indicated 60 mph is 61.3 mph on 325/50R22.

Is this a safe swap?

Diameter difference +2.11%: within the ±3% guideline

By overall diameter alone, 325/50R22 falls inside the ±3% range commonly used as a guideline when replacing 275/65R20. 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.

275/65R20 vs 325/50R22 differences
Measurement	275/65R20	325/50R22	Difference	% diff
Overall diameter	34.07 in (865.5 mm)	34.80 in (883.8 mm)	+0.72 in (+18.3 mm)	+2.11%
Sidewall height	7.04 in (178.8 mm)	6.40 in (162.5 mm)	−0.64 in (−16.2 mm)	−9.09%
Section width	10.83 in (275.0 mm)	12.80 in (325.0 mm)	+1.97 in (+50.0 mm)	+18.18%
Circumference	107.05 in (2,719.0 mm)	109.31 in (2,776.5 mm)	+2.26 in (+57.5 mm)	+2.11%
Revolutions per mile	592	580	−12	−2.07%

True speed with the speedometer calibrated for 275/65R20
Indicated	Actual on 275/65R20	Actual on 325/50R22	Difference
30 mph	30.0 mph	30.6 mph	+0.6 mph
60 mph	60.0 mph	61.3 mph	+1.3 mph
75 mph	75.0 mph	76.6 mph	+1.6 mph

Ride-height change: 325/50R22 raises the vehicle by 0.36 in (9.1 mm) at the axle (half the +18.3 mm diameter difference).

325/50R22 is 0.72 in taller than 275/65R20 and 50 mm wider, a 2.11% difference in overall diameter.

With the speedometer calibrated for 275/65R20, an indicated 60 mph is actually 61.3 mph on 325/50R22, and revolutions per mile change from 592 to 580.

325/50R22 mounts on a 22-inch wheel, a plus-2 fitment from the 20-inch wheel of 275/65R20.

Size pages

Other comparisons with 275/65R20

Other comparisons with 325/50R22

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