235/60R19 vs 265/50R20

265/50R20 is 0.33 in (8.4 mm) taller than 235/60R19, a +1.10% diameter difference. With the speedometer set for 235/60R19, an indicated 60 mph is 60.7 mph on 265/50R20.

Is this a safe swap?

Diameter difference +1.10%: within the ±3% guideline

By overall diameter alone, 265/50R20 falls inside the ±3% range commonly used as a guideline when replacing 235/60R19. 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.

235/60R19 vs 265/50R20 differences
Measurement	235/60R19	265/50R20	Difference	% diff
Overall diameter	30.10 in (764.6 mm)	30.43 in (773.0 mm)	+0.33 in (+8.4 mm)	+1.10%
Sidewall height	5.55 in (141.0 mm)	5.22 in (132.5 mm)	−0.33 in (−8.5 mm)	−6.03%
Section width	9.25 in (235.0 mm)	10.43 in (265.0 mm)	+1.18 in (+30.0 mm)	+12.77%
Circumference	94.57 in (2,402.1 mm)	95.61 in (2,428.5 mm)	+1.04 in (+26.4 mm)	+1.10%
Revolutions per mile	670	663	−7	−1.09%

True speed with the speedometer calibrated for 235/60R19
Indicated	Actual on 235/60R19	Actual on 265/50R20	Difference
30 mph	30.0 mph	30.3 mph	+0.3 mph
60 mph	60.0 mph	60.7 mph	+0.7 mph
75 mph	75.0 mph	75.8 mph	+0.8 mph

Ride-height change: 265/50R20 raises the vehicle by 0.17 in (4.2 mm) at the axle (half the +8.4 mm diameter difference).

265/50R20 is 0.33 in taller than 235/60R19 and 30 mm wider, a 1.10% difference in overall diameter.

With the speedometer calibrated for 235/60R19, an indicated 60 mph is actually 60.7 mph on 265/50R20, and revolutions per mile change from 670 to 663.

265/50R20 mounts on a 20-inch wheel, a plus-1 fitment from the 19-inch wheel of 235/60R19.

Size pages

Other comparisons with 235/60R19

Other comparisons with 265/50R20

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