TireSizesFinder

265/50R18 vs 235/50R19

235/50R19 is 0.18 in (4.6 mm) shorter than 265/50R18, a −0.64% diameter difference. With the speedometer set for 265/50R18, an indicated 60 mph is 59.6 mph on 235/50R19.

Is this a safe swap?

Diameter difference −0.64%: under 1%

By overall diameter alone, 235/50R19 is a near match for 265/50R18; the speedometer changes by less than 1%. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 265/50R18 (28.43 in) vs 235/50R19 (28.25 in)265/50R1828.43 in × 10.43 in235/50R1928.25 in × 9.25 in
Side profile and tread width, drawn to the same scale.
265/50R18 vs 235/50R19 differences
Measurement265/50R18235/50R19Difference% diff
Overall diameter28.43 in (722.2 mm)28.25 in (717.6 mm)−0.18 in (−4.6 mm)−0.64%
Sidewall height5.22 in (132.5 mm)4.63 in (117.5 mm)−0.59 in (−15.0 mm)−11.32%
Section width10.43 in (265.0 mm)9.25 in (235.0 mm)−1.18 in (−30.0 mm)−11.32%
Circumference89.33 in (2,268.9 mm)88.76 in (2,254.4 mm)−0.57 in (−14.5 mm)−0.64%
Revolutions per mile709714+5+0.64%
True speed with the speedometer calibrated for 265/50R18
IndicatedActual on 265/50R18Actual on 235/50R19Difference
30 mph30.0 mph29.8 mph−0.2 mph
60 mph60.0 mph59.6 mph−0.4 mph
75 mph75.0 mph74.5 mph−0.5 mph

Ride-height change: 235/50R19 lowers the vehicle by 0.09 in (2.3 mm) at the axle (half the −4.6 mm diameter difference).

235/50R19 is 0.18 in shorter than 265/50R18 and 30 mm narrower, a 0.64% difference in overall diameter.

With the speedometer calibrated for 265/50R18, an indicated 60 mph is actually 59.6 mph on 235/50R19, and revolutions per mile change from 709 to 714.

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

Size pages

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Source: Calculated from standard tire geometry formulas. Verified . How these numbers are calculated.