TireSizesFinder

185/65R14 vs 195/55R15

195/55R15 is 0.02 in (0.6 mm) shorter than 185/65R14, a −0.10% diameter difference. With the speedometer set for 185/65R14, an indicated 60 mph is 59.9 mph on 195/55R15.

Is this a safe swap?

Diameter difference −0.10%: under 1%

By overall diameter alone, 195/55R15 is a near match for 185/65R14; 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: 185/65R14 (23.47 in) vs 195/55R15 (23.44 in)185/65R1423.47 in × 7.28 in195/55R1523.44 in × 7.68 in
Side profile and tread width, drawn to the same scale.
185/65R14 vs 195/55R15 differences
Measurement185/65R14195/55R15Difference% diff
Overall diameter23.47 in (596.1 mm)23.44 in (595.5 mm)−0.02 in (−0.6 mm)−0.10%
Sidewall height4.73 in (120.3 mm)4.22 in (107.3 mm)−0.51 in (−13.0 mm)−10.81%
Section width7.28 in (185.0 mm)7.68 in (195.0 mm)+0.39 in (+10.0 mm)+5.41%
Circumference73.73 in (1,872.7 mm)73.65 in (1,870.8 mm)−0.07 in (−1.9 mm)−0.10%
Revolutions per mile859860+1+0.10%
True speed with the speedometer calibrated for 185/65R14
IndicatedActual on 185/65R14Actual on 195/55R15Difference
30 mph30.0 mph30.0 mph0.0 mph
60 mph60.0 mph59.9 mph−0.1 mph
75 mph75.0 mph74.9 mph−0.1 mph

Ride-height change: 195/55R15 lowers the vehicle by 0.01 in (0.3 mm) at the axle (half the −0.6 mm diameter difference).

195/55R15 is 0.02 in shorter than 185/65R14 and 10 mm wider, a 0.10% difference in overall diameter.

With the speedometer calibrated for 185/65R14, an indicated 60 mph is actually 59.9 mph on 195/55R15, and revolutions per mile change from 859 to 860.

195/55R15 mounts on a 15-inch wheel, a plus-1 fitment from the 14-inch wheel of 185/65R14.

Size pages

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