295/45R20 vs 305/35R22

305/35R22 is 0.05 in (1.2 mm) shorter than 295/45R20, a −0.16% diameter difference. With the speedometer set for 295/45R20, an indicated 60 mph is 59.9 mph on 305/35R22.

Is this a safe swap?

Diameter difference −0.16%: under 1%

By overall diameter alone, 305/35R22 is a near match for 295/45R20; the speedometer changes by less than 1%. 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.

295/45R20 vs 305/35R22 differences
Measurement	295/45R20	305/35R22	Difference	% diff
Overall diameter	30.45 in (773.5 mm)	30.41 in (772.3 mm)	−0.05 in (−1.2 mm)	−0.16%
Sidewall height	5.23 in (132.8 mm)	4.20 in (106.8 mm)	−1.02 in (−26.0 mm)	−19.59%
Section width	11.61 in (295.0 mm)	12.01 in (305.0 mm)	+0.39 in (+10.0 mm)	+3.39%
Circumference	95.67 in (2,430.0 mm)	95.52 in (2,426.3 mm)	−0.15 in (−3.8 mm)	−0.16%
Revolutions per mile	662	663	+1	+0.16%

True speed with the speedometer calibrated for 295/45R20
Indicated	Actual on 295/45R20	Actual on 305/35R22	Difference
30 mph	30.0 mph	30.0 mph	0.0 mph
60 mph	60.0 mph	59.9 mph	−0.1 mph
75 mph	75.0 mph	74.9 mph	−0.1 mph

Ride-height change: 305/35R22 lowers the vehicle by 0.02 in (0.6 mm) at the axle (half the −1.2 mm diameter difference).

305/35R22 is 0.05 in shorter than 295/45R20 and 10 mm wider, a 0.16% difference in overall diameter.

With the speedometer calibrated for 295/45R20, an indicated 60 mph is actually 59.9 mph on 305/35R22, and revolutions per mile change from 662 to 663.

305/35R22 mounts on a 22-inch wheel, a plus-2 fitment from the 20-inch wheel of 295/45R20.

Size pages

Other comparisons with 295/45R20

Other comparisons with 305/35R22

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