265/50R19 vs 295/40R20

295/40R20 is 0.14 in (3.6 mm) shorter than 265/50R19, a −0.48% diameter difference. With the speedometer set for 265/50R19, an indicated 60 mph is 59.7 mph on 295/40R20.

Is this a safe swap?

Diameter difference −0.48%: under 1%

By overall diameter alone, 295/40R20 is a near match for 265/50R19; 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.

265/50R19 vs 295/40R20 differences
Measurement	265/50R19	295/40R20	Difference	% diff
Overall diameter	29.43 in (747.6 mm)	29.29 in (744.0 mm)	−0.14 in (−3.6 mm)	−0.48%
Sidewall height	5.22 in (132.5 mm)	4.65 in (118.0 mm)	−0.57 in (−14.5 mm)	−10.94%
Section width	10.43 in (265.0 mm)	11.61 in (295.0 mm)	+1.18 in (+30.0 mm)	+11.32%
Circumference	92.47 in (2,348.7 mm)	92.02 in (2,337.3 mm)	−0.45 in (−11.3 mm)	−0.48%
Revolutions per mile	685	689	+3	+0.48%

True speed with the speedometer calibrated for 265/50R19
Indicated	Actual on 265/50R19	Actual on 295/40R20	Difference
30 mph	30.0 mph	29.9 mph	−0.1 mph
60 mph	60.0 mph	59.7 mph	−0.3 mph
75 mph	75.0 mph	74.6 mph	−0.4 mph

Ride-height change: 295/40R20 lowers the vehicle by 0.07 in (1.8 mm) at the axle (half the −3.6 mm diameter difference).

295/40R20 is 0.14 in shorter than 265/50R19 and 30 mm wider, a 0.48% difference in overall diameter.

With the speedometer calibrated for 265/50R19, an indicated 60 mph is actually 59.7 mph on 295/40R20, and revolutions per mile change from 685 to 689.

295/40R20 mounts on a 20-inch wheel, a plus-1 fitment from the 19-inch wheel of 265/50R19.

Size pages

Other comparisons with 265/50R19

Other comparisons with 295/40R20

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