265/35R20 vs 245/30R22

245/30R22 is 0.48 in (12.3 mm) taller than 265/35R20, a +1.77% diameter difference. With the speedometer set for 265/35R20, an indicated 60 mph is 61.1 mph on 245/30R22.

Is this a safe swap?

Diameter difference +1.77%: within the ±3% guideline

By overall diameter alone, 245/30R22 falls inside the ±3% range commonly used as a guideline when replacing 265/35R20. 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.

265/35R20 vs 245/30R22 differences
Measurement	265/35R20	245/30R22	Difference	% diff
Overall diameter	27.30 in (693.5 mm)	27.79 in (705.8 mm)	+0.48 in (+12.3 mm)	+1.77%
Sidewall height	3.65 in (92.8 mm)	2.89 in (73.5 mm)	−0.76 in (−19.2 mm)	−20.75%
Section width	10.43 in (265.0 mm)	9.65 in (245.0 mm)	−0.79 in (−20.0 mm)	−7.55%
Circumference	85.78 in (2,178.7 mm)	87.30 in (2,217.3 mm)	+1.52 in (+38.6 mm)	+1.77%
Revolutions per mile	739	726	−13	−1.74%

True speed with the speedometer calibrated for 265/35R20
Indicated	Actual on 265/35R20	Actual on 245/30R22	Difference
30 mph	30.0 mph	30.5 mph	+0.5 mph
60 mph	60.0 mph	61.1 mph	+1.1 mph
75 mph	75.0 mph	76.3 mph	+1.3 mph

Ride-height change: 245/30R22 raises the vehicle by 0.24 in (6.1 mm) at the axle (half the +12.3 mm diameter difference).

245/30R22 is 0.48 in taller than 265/35R20 and 20 mm narrower, a 1.77% difference in overall diameter.

With the speedometer calibrated for 265/35R20, an indicated 60 mph is actually 61.1 mph on 245/30R22, and revolutions per mile change from 739 to 726.

245/30R22 mounts on a 22-inch wheel, a plus-2 fitment from the 20-inch wheel of 265/35R20.

Size pages

Other comparisons with 265/35R20

Other comparisons with 245/30R22

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