265/50R20 vs 295/45R20

295/45R20 is 0.02 in (0.5 mm) taller than 265/50R20, a +0.06% diameter difference. With the speedometer set for 265/50R20, an indicated 60 mph is 60.0 mph on 295/45R20.

Is this a safe swap?

Diameter difference +0.06%: under 1%

By overall diameter alone, 295/45R20 is a near match for 265/50R20; 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.

265/50R20 vs 295/45R20 differences
Measurement	265/50R20	295/45R20	Difference	% diff
Overall diameter	30.43 in (773.0 mm)	30.45 in (773.5 mm)	+0.02 in (+0.5 mm)	+0.06%
Sidewall height	5.22 in (132.5 mm)	5.23 in (132.8 mm)	+0.01 in (+0.3 mm)	+0.19%
Section width	10.43 in (265.0 mm)	11.61 in (295.0 mm)	+1.18 in (+30.0 mm)	+11.32%
Circumference	95.61 in (2,428.5 mm)	95.67 in (2,430.0 mm)	+0.06 in (+1.6 mm)	+0.06%
Revolutions per mile	663	662	0	−0.06%

True speed with the speedometer calibrated for 265/50R20
Indicated	Actual on 265/50R20	Actual on 295/45R20
30 mph	30.0 mph	30.0 mph
60 mph	60.0 mph	60.0 mph
75 mph	75.0 mph	75.0 mph

Ride-height change: 295/45R20 raises the vehicle by 0.01 in (0.3 mm) at the axle (half the +0.5 mm diameter difference).

295/45R20 is 0.02 in taller than 265/50R20 and 30 mm wider, a 0.06% difference in overall diameter.

With the speedometer calibrated for 265/50R20, an indicated 60 mph is actually 60.0 mph on 295/45R20, and revolutions per mile change from 663 to 662.

Both sizes mount on 20-inch wheels.

Size pages

Other comparisons with 265/50R20

Other comparisons with 295/45R20

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