TireSizesFinder

255/60R18 vs 275/50R19

275/50R19 is 0.22 in (5.6 mm) shorter than 255/60R18, a −0.73% diameter difference. With the speedometer set for 255/60R18, an indicated 60 mph is 59.6 mph on 275/50R19.

Is this a safe swap?

Diameter difference −0.73%: under 1%

By overall diameter alone, 275/50R19 is a near match for 255/60R18; 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: 255/60R18 (30.05 in) vs 275/50R19 (29.83 in)255/60R1830.05 in × 10.04 in275/50R1929.83 in × 10.83 in
Side profile and tread width, drawn to the same scale.
255/60R18 vs 275/50R19 differences
Measurement255/60R18275/50R19Difference% diff
Overall diameter30.05 in (763.2 mm)29.83 in (757.6 mm)−0.22 in (−5.6 mm)−0.73%
Sidewall height6.02 in (153.0 mm)5.41 in (137.5 mm)−0.61 in (−15.5 mm)−10.13%
Section width10.04 in (255.0 mm)10.83 in (275.0 mm)+0.79 in (+20.0 mm)+7.84%
Circumference94.40 in (2,397.7 mm)93.70 in (2,380.1 mm)−0.69 in (−17.6 mm)−0.73%
Revolutions per mile671676+5+0.74%
True speed with the speedometer calibrated for 255/60R18
IndicatedActual on 255/60R18Actual on 275/50R19Difference
30 mph30.0 mph29.8 mph−0.2 mph
60 mph60.0 mph59.6 mph−0.4 mph
75 mph75.0 mph74.4 mph−0.6 mph

Ride-height change: 275/50R19 lowers the vehicle by 0.11 in (2.8 mm) at the axle (half the −5.6 mm diameter difference).

275/50R19 is 0.22 in shorter than 255/60R18 and 20 mm wider, a 0.73% difference in overall diameter.

With the speedometer calibrated for 255/60R18, an indicated 60 mph is actually 59.6 mph on 275/50R19, and revolutions per mile change from 671 to 676.

275/50R19 mounts on a 19-inch wheel, a plus-1 fitment from the 18-inch wheel of 255/60R18.

Size pages

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