TireSizesFinder

235/60R18 vs 235/55R19

235/55R19 is 0.07 in (1.9 mm) taller than 235/60R18, a +0.26% diameter difference. With the speedometer set for 235/60R18, an indicated 60 mph is 60.2 mph on 235/55R19.

Is this a safe swap?

Diameter difference +0.26%: under 1%

By overall diameter alone, 235/55R19 is a near match for 235/60R18; 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: 235/60R18 (29.10 in) vs 235/55R19 (29.18 in)235/60R1829.10 in × 9.25 in235/55R1929.18 in × 9.25 in
Side profile and tread width, drawn to the same scale.
235/60R18 vs 235/55R19 differences
Measurement235/60R18235/55R19Difference% diff
Overall diameter29.10 in (739.2 mm)29.18 in (741.1 mm)+0.07 in (+1.9 mm)+0.26%
Sidewall height5.55 in (141.0 mm)5.09 in (129.3 mm)−0.46 in (−11.7 mm)−8.33%
Section width9.25 in (235.0 mm)9.25 in (235.0 mm)0.00 in (0.0 mm)0.00%
Circumference91.43 in (2,322.3 mm)91.66 in (2,328.2 mm)+0.24 in (+6.0 mm)+0.26%
Revolutions per mile693691−2−0.26%
True speed with the speedometer calibrated for 235/60R18
IndicatedActual on 235/60R18Actual on 235/55R19Difference
30 mph30.0 mph30.1 mph+0.1 mph
60 mph60.0 mph60.2 mph+0.2 mph
75 mph75.0 mph75.2 mph+0.2 mph

Ride-height change: 235/55R19 raises the vehicle by 0.04 in (0.9 mm) at the axle (half the +1.9 mm diameter difference).

235/55R19 is 0.07 in taller than 235/60R18 and the same width, a 0.26% difference in overall diameter.

With the speedometer calibrated for 235/60R18, an indicated 60 mph is actually 60.2 mph on 235/55R19, and revolutions per mile change from 693 to 691.

235/55R19 mounts on a 19-inch wheel, a plus-1 fitment from the 18-inch wheel of 235/60R18.

Size pages

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