295/40R19 vs 265/40R20

265/40R20 is 0.06 in (1.4 mm) taller than 295/40R19, a +0.19% diameter difference. With the speedometer set for 295/40R19, an indicated 60 mph is 60.1 mph on 265/40R20.

Is this a safe swap?

Diameter difference +0.19%: under 1%

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

295/40R19 vs 265/40R20 differences
Measurement	295/40R19	265/40R20	Difference	% diff
Overall diameter	28.29 in (718.6 mm)	28.35 in (720.0 mm)	+0.06 in (+1.4 mm)	+0.19%
Sidewall height	4.65 in (118.0 mm)	4.17 in (106.0 mm)	−0.47 in (−12.0 mm)	−10.17%
Section width	11.61 in (295.0 mm)	10.43 in (265.0 mm)	−1.18 in (−30.0 mm)	−10.17%
Circumference	88.88 in (2,257.5 mm)	89.05 in (2,261.9 mm)	+0.17 in (+4.4 mm)	+0.19%
Revolutions per mile	713	711	−1	−0.19%

True speed with the speedometer calibrated for 295/40R19
Indicated	Actual on 295/40R19	Actual on 265/40R20	Difference
30 mph	30.0 mph	30.1 mph	+0.1 mph
60 mph	60.0 mph	60.1 mph	+0.1 mph
75 mph	75.0 mph	75.1 mph	+0.1 mph

Ride-height change: 265/40R20 raises the vehicle by 0.03 in (0.7 mm) at the axle (half the +1.4 mm diameter difference).

265/40R20 is 0.06 in taller than 295/40R19 and 30 mm narrower, a 0.19% difference in overall diameter.

With the speedometer calibrated for 295/40R19, an indicated 60 mph is actually 60.1 mph on 265/40R20, and revolutions per mile change from 713 to 711.

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

Size pages

Other comparisons with 295/40R19

Other comparisons with 265/40R20

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