245/45R20 vs 295/30R22

295/30R22 is 0.29 in (7.3 mm) taller than 245/45R20, a +1.00% diameter difference. With the speedometer set for 245/45R20, an indicated 60 mph is 60.6 mph on 295/30R22.

Is this a safe swap?

Diameter difference +1.00%: within the ±3% guideline

By overall diameter alone, 295/30R22 falls inside the ±3% range commonly used as a guideline when replacing 245/45R20. 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.

245/45R20 vs 295/30R22 differences
Measurement	245/45R20	295/30R22	Difference	% diff
Overall diameter	28.68 in (728.5 mm)	28.97 in (735.8 mm)	+0.29 in (+7.3 mm)	+1.00%
Sidewall height	4.34 in (110.3 mm)	3.48 in (88.5 mm)	−0.86 in (−21.7 mm)	−19.73%
Section width	9.65 in (245.0 mm)	11.61 in (295.0 mm)	+1.97 in (+50.0 mm)	+20.41%
Circumference	90.10 in (2,288.7 mm)	91.01 in (2,311.6 mm)	+0.90 in (+22.9 mm)	+1.00%
Revolutions per mile	703	696	−7	−0.99%

True speed with the speedometer calibrated for 245/45R20
Indicated	Actual on 245/45R20	Actual on 295/30R22	Difference
30 mph	30.0 mph	30.3 mph	+0.3 mph
60 mph	60.0 mph	60.6 mph	+0.6 mph
75 mph	75.0 mph	75.8 mph	+0.8 mph

Ride-height change: 295/30R22 raises the vehicle by 0.14 in (3.6 mm) at the axle (half the +7.3 mm diameter difference).

295/30R22 is 0.29 in taller than 245/45R20 and 50 mm wider, a 1.00% difference in overall diameter.

With the speedometer calibrated for 245/45R20, an indicated 60 mph is actually 60.6 mph on 295/30R22, and revolutions per mile change from 703 to 696.

295/30R22 mounts on a 22-inch wheel, a plus-2 fitment from the 20-inch wheel of 245/45R20.

Size pages

Other comparisons with 245/45R20

Other comparisons with 295/30R22

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