235/60R18 vs 265/50R19

265/50R19 is 0.33 in (8.4 mm) taller than 235/60R18, a +1.14% diameter difference. With the speedometer set for 235/60R18, an indicated 60 mph is 60.7 mph on 265/50R19.

Is this a safe swap?

Diameter difference +1.14%: within the ±3% guideline

By overall diameter alone, 265/50R19 falls inside the ±3% range commonly used as a guideline when replacing 235/60R18. 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.

235/60R18 vs 265/50R19 differences
Measurement	235/60R18	265/50R19	Difference	% diff
Overall diameter	29.10 in (739.2 mm)	29.43 in (747.6 mm)	+0.33 in (+8.4 mm)	+1.14%
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	91.43 in (2,322.3 mm)	92.47 in (2,348.7 mm)	+1.04 in (+26.4 mm)	+1.14%
Revolutions per mile	693	685	−8	−1.12%

True speed with the speedometer calibrated for 235/60R18
Indicated	Actual on 235/60R18	Actual on 265/50R19	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	75.9 mph	+0.9 mph

Ride-height change: 265/50R19 raises the vehicle by 0.17 in (4.2 mm) at the axle (half the +8.4 mm diameter difference).

265/50R19 is 0.33 in taller than 235/60R18 and 30 mm wider, a 1.14% difference in overall diameter.

With the speedometer calibrated for 235/60R18, an indicated 60 mph is actually 60.7 mph on 265/50R19, and revolutions per mile change from 693 to 685.

265/50R19 mounts on a 19-inch wheel, a plus-1 fitment from the 18-inch wheel of 235/60R18.

Size pages

Other comparisons with 235/60R18

Other comparisons with 265/50R19

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