TireSizesFinder

275/55R18 vs 235/60R19

235/60R19 is 0.19 in (4.9 mm) taller than 275/55R18, a +0.64% diameter difference. With the speedometer set for 275/55R18, an indicated 60 mph is 60.4 mph on 235/60R19.

Is this a safe swap?

Diameter difference +0.64%: under 1%

By overall diameter alone, 235/60R19 is a near match for 275/55R18; 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: 275/55R18 (29.91 in) vs 235/60R19 (30.10 in)275/55R1829.91 in × 10.83 in235/60R1930.10 in × 9.25 in
Side profile and tread width, drawn to the same scale.
275/55R18 vs 235/60R19 differences
Measurement275/55R18235/60R19Difference% diff
Overall diameter29.91 in (759.7 mm)30.10 in (764.6 mm)+0.19 in (+4.9 mm)+0.64%
Sidewall height5.95 in (151.3 mm)5.55 in (141.0 mm)−0.40 in (−10.2 mm)−6.78%
Section width10.83 in (275.0 mm)9.25 in (235.0 mm)−1.57 in (−40.0 mm)−14.55%
Circumference93.96 in (2,386.7 mm)94.57 in (2,402.1 mm)+0.61 in (+15.4 mm)+0.64%
Revolutions per mile674670−4−0.64%
True speed with the speedometer calibrated for 275/55R18
IndicatedActual on 275/55R18Actual on 235/60R19Difference
30 mph30.0 mph30.2 mph+0.2 mph
60 mph60.0 mph60.4 mph+0.4 mph
75 mph75.0 mph75.5 mph+0.5 mph

Ride-height change: 235/60R19 raises the vehicle by 0.10 in (2.4 mm) at the axle (half the +4.9 mm diameter difference).

235/60R19 is 0.19 in taller than 275/55R18 and 40 mm narrower, a 0.64% difference in overall diameter.

With the speedometer calibrated for 275/55R18, an indicated 60 mph is actually 60.4 mph on 235/60R19, and revolutions per mile change from 674 to 670.

235/60R19 mounts on a 19-inch wheel, a plus-1 fitment from the 18-inch wheel of 275/55R18.

Size pages

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