TireSizesFinder

255/70R16 vs 275/60R17

275/60R17 is 0.06 in (1.6 mm) shorter than 255/70R16, a −0.21% diameter difference. With the speedometer set for 255/70R16, an indicated 60 mph is 59.9 mph on 275/60R17.

Is this a safe swap?

Diameter difference −0.21%: under 1%

By overall diameter alone, 275/60R17 is a near match for 255/70R16; 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: 255/70R16 (30.06 in) vs 275/60R17 (29.99 in)255/70R1630.06 in × 10.04 in275/60R1729.99 in × 10.83 in
Side profile and tread width, drawn to the same scale.
255/70R16 vs 275/60R17 differences
Measurement255/70R16275/60R17Difference% diff
Overall diameter30.06 in (763.4 mm)29.99 in (761.8 mm)−0.06 in (−1.6 mm)−0.21%
Sidewall height7.03 in (178.5 mm)6.50 in (165.0 mm)−0.53 in (−13.5 mm)−7.56%
Section width10.04 in (255.0 mm)10.83 in (275.0 mm)+0.79 in (+20.0 mm)+7.84%
Circumference94.42 in (2,398.3 mm)94.22 in (2,393.3 mm)−0.20 in (−5.0 mm)−0.21%
Revolutions per mile671672+1+0.21%
True speed with the speedometer calibrated for 255/70R16
IndicatedActual on 255/70R16Actual on 275/60R17Difference
30 mph30.0 mph29.9 mph−0.1 mph
60 mph60.0 mph59.9 mph−0.1 mph
75 mph75.0 mph74.8 mph−0.2 mph

Ride-height change: 275/60R17 lowers the vehicle by 0.03 in (0.8 mm) at the axle (half the −1.6 mm diameter difference).

275/60R17 is 0.06 in shorter than 255/70R16 and 20 mm wider, a 0.21% difference in overall diameter.

With the speedometer calibrated for 255/70R16, an indicated 60 mph is actually 59.9 mph on 275/60R17, and revolutions per mile change from 671 to 672.

275/60R17 mounts on a 17-inch wheel, a plus-1 fitment from the 16-inch wheel of 255/70R16.

Size pages

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