265/60R20 vs 325/45R22

325/45R22 is 1.00 in (25.3 mm) taller than 265/60R20, a +3.06% diameter difference. With the speedometer set for 265/60R20, an indicated 60 mph is 61.8 mph on 325/45R22.

Is this a safe swap?

Diameter difference +3.06%: outside the ±3% guideline

By overall diameter alone, 325/45R22 falls outside the ±3% range commonly used as a guideline when replacing 265/60R20; speedometer and ride-height changes are larger. 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.

265/60R20 vs 325/45R22 differences
Measurement	265/60R20	325/45R22	Difference	% diff
Overall diameter	32.52 in (826.0 mm)	33.52 in (851.3 mm)	+1.00 in (+25.3 mm)	+3.06%
Sidewall height	6.26 in (159.0 mm)	5.76 in (146.3 mm)	−0.50 in (−12.7 mm)	−8.02%
Section width	10.43 in (265.0 mm)	12.80 in (325.0 mm)	+2.36 in (+60.0 mm)	+22.64%
Circumference	102.16 in (2,595.0 mm)	105.29 in (2,674.4 mm)	+3.13 in (+79.5 mm)	+3.06%
Revolutions per mile	620	602	−18	−2.97%

True speed with the speedometer calibrated for 265/60R20
Indicated	Actual on 265/60R20	Actual on 325/45R22	Difference
30 mph	30.0 mph	30.9 mph	+0.9 mph
60 mph	60.0 mph	61.8 mph	+1.8 mph
75 mph	75.0 mph	77.3 mph	+2.3 mph

Ride-height change: 325/45R22 raises the vehicle by 0.50 in (12.6 mm) at the axle (half the +25.3 mm diameter difference).

325/45R22 is 1.00 in taller than 265/60R20 and 60 mm wider, a 3.06% difference in overall diameter.

With the speedometer calibrated for 265/60R20, an indicated 60 mph is actually 61.8 mph on 325/45R22, and revolutions per mile change from 620 to 602.

325/45R22 mounts on a 22-inch wheel, a plus-2 fitment from the 20-inch wheel of 265/60R20.

Size pages

Other comparisons with 265/60R20

Other comparisons with 325/45R22

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