TireSizesFinder

185/60R15 vs 185/55R16

185/55R16 is 0.27 in (6.9 mm) taller than 185/60R15, a +1.14% diameter difference. With the speedometer set for 185/60R15, an indicated 60 mph is 60.7 mph on 185/55R16.

Is this a safe swap?

Diameter difference +1.14%: within the ±3% guideline

By overall diameter alone, 185/55R16 falls inside the ±3% range commonly used as a guideline when replacing 185/60R15. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 185/60R15 (23.74 in) vs 185/55R16 (24.01 in)185/60R1523.74 in × 7.28 in185/55R1624.01 in × 7.28 in
Side profile and tread width, drawn to the same scale.
185/60R15 vs 185/55R16 differences
Measurement185/60R15185/55R16Difference% diff
Overall diameter23.74 in (603.0 mm)24.01 in (609.9 mm)+0.27 in (+6.9 mm)+1.14%
Sidewall height4.37 in (111.0 mm)4.01 in (101.8 mm)−0.36 in (−9.2 mm)−8.33%
Section width7.28 in (185.0 mm)7.28 in (185.0 mm)0.00 in (0.0 mm)0.00%
Circumference74.58 in (1,894.4 mm)75.44 in (1,916.1 mm)+0.85 in (+21.7 mm)+1.14%
Revolutions per mile850840−10−1.13%
True speed with the speedometer calibrated for 185/60R15
IndicatedActual on 185/60R15Actual on 185/55R16Difference
30 mph30.0 mph30.3 mph+0.3 mph
60 mph60.0 mph60.7 mph+0.7 mph
75 mph75.0 mph75.9 mph+0.9 mph

Ride-height change: 185/55R16 raises the vehicle by 0.14 in (3.4 mm) at the axle (half the +6.9 mm diameter difference).

185/55R16 is 0.27 in taller than 185/60R15 and the same width, a 1.14% difference in overall diameter.

With the speedometer calibrated for 185/60R15, an indicated 60 mph is actually 60.7 mph on 185/55R16, and revolutions per mile change from 850 to 840.

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

Size pages

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