295/55R20 vs 325/45R22

325/45R22 is 0.74 in (18.8 mm) taller than 295/55R20, a +2.26% diameter difference. With the speedometer set for 295/55R20, an indicated 60 mph is 61.4 mph on 325/45R22.

Is this a safe swap?

Diameter difference +2.26%: within the ±3% guideline

By overall diameter alone, 325/45R22 falls inside the ±3% range commonly used as a guideline when replacing 295/55R20. 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.

295/55R20 vs 325/45R22 differences
Measurement	295/55R20	325/45R22	Difference	% diff
Overall diameter	32.78 in (832.5 mm)	33.52 in (851.3 mm)	+0.74 in (+18.8 mm)	+2.26%
Sidewall height	6.39 in (162.3 mm)	5.76 in (146.3 mm)	−0.63 in (−16.0 mm)	−9.86%
Section width	11.61 in (295.0 mm)	12.80 in (325.0 mm)	+1.18 in (+30.0 mm)	+10.17%
Circumference	102.97 in (2,615.4 mm)	105.29 in (2,674.4 mm)	+2.33 in (+59.1 mm)	+2.26%
Revolutions per mile	615	602	−14	−2.21%

True speed with the speedometer calibrated for 295/55R20
Indicated	Actual on 295/55R20	Actual on 325/45R22	Difference
30 mph	30.0 mph	30.7 mph	+0.7 mph
60 mph	60.0 mph	61.4 mph	+1.4 mph
75 mph	75.0 mph	76.7 mph	+1.7 mph

Ride-height change: 325/45R22 raises the vehicle by 0.37 in (9.4 mm) at the axle (half the +18.8 mm diameter difference).

325/45R22 is 0.74 in taller than 295/55R20 and 30 mm wider, a 2.26% difference in overall diameter.

With the speedometer calibrated for 295/55R20, an indicated 60 mph is actually 61.4 mph on 325/45R22, and revolutions per mile change from 615 to 602.

325/45R22 mounts on a 22-inch wheel, a plus-2 fitment from the 20-inch wheel of 295/55R20.

Size pages

Other comparisons with 295/55R20

Other comparisons with 325/45R22

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