275/60R20 vs 325/45R22

325/45R22 is 0.52 in (13.3 mm) taller than 275/60R20, a +1.59% diameter difference. With the speedometer set for 275/60R20, an indicated 60 mph is 61.0 mph on 325/45R22.

Is this a safe swap?

Diameter difference +1.59%: within the ±3% guideline

By overall diameter alone, 325/45R22 falls inside the ±3% range commonly used as a guideline when replacing 275/60R20. 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.

275/60R20 vs 325/45R22 differences
Measurement	275/60R20	325/45R22	Difference	% diff
Overall diameter	32.99 in (838.0 mm)	33.52 in (851.3 mm)	+0.52 in (+13.3 mm)	+1.59%
Sidewall height	6.50 in (165.0 mm)	5.76 in (146.3 mm)	−0.74 in (−18.7 mm)	−11.36%
Section width	10.83 in (275.0 mm)	12.80 in (325.0 mm)	+1.97 in (+50.0 mm)	+18.18%
Circumference	103.65 in (2,632.7 mm)	105.29 in (2,674.4 mm)	+1.65 in (+41.8 mm)	+1.59%
Revolutions per mile	611	602	−10	−1.56%

True speed with the speedometer calibrated for 275/60R20
Indicated	Actual on 275/60R20	Actual on 325/45R22	Difference
30 mph	30.0 mph	30.5 mph	+0.5 mph
60 mph	60.0 mph	61.0 mph	+1.0 mph
75 mph	75.0 mph	76.2 mph	+1.2 mph

Ride-height change: 325/45R22 raises the vehicle by 0.26 in (6.6 mm) at the axle (half the +13.3 mm diameter difference).

325/45R22 is 0.52 in taller than 275/60R20 and 50 mm wider, a 1.59% difference in overall diameter.

With the speedometer calibrated for 275/60R20, an indicated 60 mph is actually 61.0 mph on 325/45R22, and revolutions per mile change from 611 to 602.

325/45R22 mounts on a 22-inch wheel, a plus-2 fitment from the 20-inch wheel of 275/60R20.

Size pages

Other comparisons with 275/60R20

Other comparisons with 325/45R22

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