TireSizesFinder

275/60R17 vs 255/55R19

255/55R19 is 0.05 in (1.3 mm) taller than 275/60R17, a +0.17% diameter difference. With the speedometer set for 275/60R17, an indicated 60 mph is 60.1 mph on 255/55R19.

Is this a safe swap?

Diameter difference +0.17%: under 1%

By overall diameter alone, 255/55R19 is a near match for 275/60R17; 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: 275/60R17 (29.99 in) vs 255/55R19 (30.04 in)275/60R1729.99 in × 10.83 in255/55R1930.04 in × 10.04 in
Side profile and tread width, drawn to the same scale.
275/60R17 vs 255/55R19 differences
Measurement275/60R17255/55R19Difference% diff
Overall diameter29.99 in (761.8 mm)30.04 in (763.1 mm)+0.05 in (+1.3 mm)+0.17%
Sidewall height6.50 in (165.0 mm)5.52 in (140.3 mm)−0.97 in (−24.7 mm)−15.00%
Section width10.83 in (275.0 mm)10.04 in (255.0 mm)−0.79 in (−20.0 mm)−7.27%
Circumference94.22 in (2,393.3 mm)94.38 in (2,397.3 mm)+0.16 in (+4.1 mm)+0.17%
Revolutions per mile672671−1−0.17%
True speed with the speedometer calibrated for 275/60R17
IndicatedActual on 275/60R17Actual on 255/55R19Difference
30 mph30.0 mph30.1 mph+0.1 mph
60 mph60.0 mph60.1 mph+0.1 mph
75 mph75.0 mph75.1 mph+0.1 mph

Ride-height change: 255/55R19 raises the vehicle by 0.03 in (0.6 mm) at the axle (half the +1.3 mm diameter difference).

255/55R19 is 0.05 in taller than 275/60R17 and 20 mm narrower, a 0.17% difference in overall diameter.

With the speedometer calibrated for 275/60R17, an indicated 60 mph is actually 60.1 mph on 255/55R19, and revolutions per mile change from 672 to 671.

255/55R19 mounts on a 19-inch wheel, a plus-2 fitment from the 17-inch wheel of 275/60R17.

Size pages

Other comparisons with 275/60R17

Other comparisons with 255/55R19

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