TireSizesFinder

185/70R14 vs 185/60R15

185/60R15 is 0.46 in (11.6 mm) shorter than 185/70R14, a −1.89% diameter difference. With the speedometer set for 185/70R14, an indicated 60 mph is 58.9 mph on 185/60R15.

Is this a safe swap?

Diameter difference −1.89%: within the ±3% guideline

By overall diameter alone, 185/60R15 falls inside the ±3% range commonly used as a guideline when replacing 185/70R14. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 185/70R14 (24.20 in) vs 185/60R15 (23.74 in)185/70R1424.20 in × 7.28 in185/60R1523.74 in × 7.28 in
Side profile and tread width, drawn to the same scale.
185/70R14 vs 185/60R15 differences
Measurement185/70R14185/60R15Difference% diff
Overall diameter24.20 in (614.6 mm)23.74 in (603.0 mm)−0.46 in (−11.6 mm)−1.89%
Sidewall height5.10 in (129.5 mm)4.37 in (111.0 mm)−0.73 in (−18.5 mm)−14.29%
Section width7.28 in (185.0 mm)7.28 in (185.0 mm)0.00 in (0.0 mm)0.00%
Circumference76.02 in (1,930.8 mm)74.58 in (1,894.4 mm)−1.43 in (−36.4 mm)−1.89%
Revolutions per mile834850+16+1.92%
True speed with the speedometer calibrated for 185/70R14
IndicatedActual on 185/70R14Actual on 185/60R15Difference
30 mph30.0 mph29.4 mph−0.6 mph
60 mph60.0 mph58.9 mph−1.1 mph
75 mph75.0 mph73.6 mph−1.4 mph

Ride-height change: 185/60R15 lowers the vehicle by 0.23 in (5.8 mm) at the axle (half the −11.6 mm diameter difference).

185/60R15 is 0.46 in shorter than 185/70R14 and the same width, a 1.89% difference in overall diameter.

With the speedometer calibrated for 185/70R14, an indicated 60 mph is actually 58.9 mph on 185/60R15, and revolutions per mile change from 834 to 850.

185/60R15 mounts on a 15-inch wheel, a plus-1 fitment from the 14-inch wheel of 185/70R14.

Size pages

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