TireSizesFinder

195/60R15 vs 185/55R16

185/55R16 is 0.20 in (5.1 mm) shorter than 195/60R15, a −0.83% diameter difference. With the speedometer set for 195/60R15, an indicated 60 mph is 59.5 mph on 185/55R16.

Is this a safe swap?

Diameter difference −0.83%: under 1%

By overall diameter alone, 185/55R16 is a near match for 195/60R15; 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: 195/60R15 (24.21 in) vs 185/55R16 (24.01 in)195/60R1524.21 in × 7.68 in185/55R1624.01 in × 7.28 in
Side profile and tread width, drawn to the same scale.
195/60R15 vs 185/55R16 differences
Measurement195/60R15185/55R16Difference% diff
Overall diameter24.21 in (615.0 mm)24.01 in (609.9 mm)−0.20 in (−5.1 mm)−0.83%
Sidewall height4.61 in (117.0 mm)4.01 in (101.8 mm)−0.60 in (−15.2 mm)−13.03%
Section width7.68 in (195.0 mm)7.28 in (185.0 mm)−0.39 in (−10.0 mm)−5.13%
Circumference76.07 in (1,932.1 mm)75.44 in (1,916.1 mm)−0.63 in (−16.0 mm)−0.83%
Revolutions per mile833840+7+0.84%
True speed with the speedometer calibrated for 195/60R15
IndicatedActual on 195/60R15Actual on 185/55R16Difference
30 mph30.0 mph29.8 mph−0.2 mph
60 mph60.0 mph59.5 mph−0.5 mph
75 mph75.0 mph74.4 mph−0.6 mph

Ride-height change: 185/55R16 lowers the vehicle by 0.10 in (2.6 mm) at the axle (half the −5.1 mm diameter difference).

185/55R16 is 0.20 in shorter than 195/60R15 and 10 mm narrower, a 0.83% difference in overall diameter.

With the speedometer calibrated for 195/60R15, an indicated 60 mph is actually 59.5 mph on 185/55R16, and revolutions per mile change from 833 to 840.

185/55R16 mounts on a 16-inch wheel, a plus-1 fitment from the 15-inch wheel of 195/60R15.

Size pages

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