195/60R14 vs 185/55R15

185/55R15 is 0.20 in (5.1 mm) shorter than 195/60R14, a −0.86% diameter difference. With the speedometer set for 195/60R14, an indicated 60 mph is 59.5 mph on 185/55R15.

Is this a safe swap?

Diameter difference −0.86%: under 1%

By overall diameter alone, 185/55R15 is a near match for 195/60R14; the speedometer changes by less than 1%. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

Side profile and tread width, drawn to the same scale.

195/60R14 vs 185/55R15 differences
Measurement	195/60R14	185/55R15	Difference	% diff
Overall diameter	23.21 in (589.6 mm)	23.01 in (584.5 mm)	−0.20 in (−5.1 mm)	−0.86%
Sidewall height	4.61 in (117.0 mm)	4.01 in (101.8 mm)	−0.60 in (−15.2 mm)	−13.03%
Section width	7.68 in (195.0 mm)	7.28 in (185.0 mm)	−0.39 in (−10.0 mm)	−5.13%
Circumference	72.92 in (1,852.3 mm)	72.29 in (1,836.3 mm)	−0.63 in (−16.0 mm)	−0.86%
Revolutions per mile	869	876	+8	+0.87%

True speed with the speedometer calibrated for 195/60R14
Indicated	Actual on 195/60R14	Actual on 185/55R15	Difference
30 mph	30.0 mph	29.7 mph	−0.3 mph
60 mph	60.0 mph	59.5 mph	−0.5 mph
75 mph	75.0 mph	74.4 mph	−0.6 mph

Ride-height change: 185/55R15 lowers the vehicle by 0.10 in (2.5 mm) at the axle (half the −5.1 mm diameter difference).

185/55R15 is 0.20 in shorter than 195/60R14 and 10 mm narrower, a 0.86% difference in overall diameter.

With the speedometer calibrated for 195/60R14, an indicated 60 mph is actually 59.5 mph on 185/55R15, and revolutions per mile change from 869 to 876.

185/55R15 mounts on a 15-inch wheel, a plus-1 fitment from the 14-inch wheel of 195/60R14.

Size pages

Other comparisons with 195/60R14

Other comparisons with 185/55R15

Source: Calculated from standard tire geometry formulas. Verified 2026-09-27. How these numbers are calculated.