TireSizesFinder

155/80R14 vs 185/60R15

185/60R15 is 0.02 in (0.6 mm) shorter than 155/80R14, a −0.10% diameter difference. With the speedometer set for 155/80R14, an indicated 60 mph is 59.9 mph on 185/60R15.

Is this a safe swap?

Diameter difference −0.10%: under 1%

By overall diameter alone, 185/60R15 is a near match for 155/80R14; 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: 155/80R14 (23.76 in) vs 185/60R15 (23.74 in)155/80R1423.76 in × 6.10 in185/60R1523.74 in × 7.28 in
Side profile and tread width, drawn to the same scale.
155/80R14 vs 185/60R15 differences
Measurement155/80R14185/60R15Difference% diff
Overall diameter23.76 in (603.6 mm)23.74 in (603.0 mm)−0.02 in (−0.6 mm)−0.10%
Sidewall height4.88 in (124.0 mm)4.37 in (111.0 mm)−0.51 in (−13.0 mm)−10.48%
Section width6.10 in (155.0 mm)7.28 in (185.0 mm)+1.18 in (+30.0 mm)+19.35%
Circumference74.66 in (1,896.3 mm)74.58 in (1,894.4 mm)−0.07 in (−1.9 mm)−0.10%
Revolutions per mile849850+1+0.10%
True speed with the speedometer calibrated for 155/80R14
IndicatedActual on 155/80R14Actual on 185/60R15Difference
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: 185/60R15 lowers the vehicle by 0.01 in (0.3 mm) at the axle (half the −0.6 mm diameter difference).

185/60R15 is 0.02 in shorter than 155/80R14 and 30 mm wider, a 0.10% difference in overall diameter.

With the speedometer calibrated for 155/80R14, an indicated 60 mph is actually 59.9 mph on 185/60R15, and revolutions per mile change from 849 to 850.

185/60R15 mounts on a 15-inch wheel, a plus-1 fitment from the 14-inch wheel of 155/80R14.

Size pages

Other comparisons with 155/80R14

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