TireSizesFinder

165/80R13 vs 185/60R15

185/60R15 is 0.35 in (8.8 mm) taller than 165/80R13, a +1.48% diameter difference. With the speedometer set for 165/80R13, an indicated 60 mph is 60.9 mph on 185/60R15.

Is this a safe swap?

Diameter difference +1.48%: within the ±3% guideline

By overall diameter alone, 185/60R15 falls inside the ±3% range commonly used as a guideline when replacing 165/80R13. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 165/80R13 (23.39 in) vs 185/60R15 (23.74 in)165/80R1323.39 in × 6.50 in185/60R1523.74 in × 7.28 in
Side profile and tread width, drawn to the same scale.
165/80R13 vs 185/60R15 differences
Measurement165/80R13185/60R15Difference% diff
Overall diameter23.39 in (594.2 mm)23.74 in (603.0 mm)+0.35 in (+8.8 mm)+1.48%
Sidewall height5.20 in (132.0 mm)4.37 in (111.0 mm)−0.83 in (−21.0 mm)−15.91%
Section width6.50 in (165.0 mm)7.28 in (185.0 mm)+0.79 in (+20.0 mm)+12.12%
Circumference73.49 in (1,866.7 mm)74.58 in (1,894.4 mm)+1.09 in (+27.6 mm)+1.48%
Revolutions per mile862850−13−1.46%
True speed with the speedometer calibrated for 165/80R13
IndicatedActual on 165/80R13Actual on 185/60R15Difference
30 mph30.0 mph30.4 mph+0.4 mph
60 mph60.0 mph60.9 mph+0.9 mph
75 mph75.0 mph76.1 mph+1.1 mph

Ride-height change: 185/60R15 raises the vehicle by 0.17 in (4.4 mm) at the axle (half the +8.8 mm diameter difference).

185/60R15 is 0.35 in taller than 165/80R13 and 20 mm wider, a 1.48% difference in overall diameter.

With the speedometer calibrated for 165/80R13, an indicated 60 mph is actually 60.9 mph on 185/60R15, and revolutions per mile change from 862 to 850.

185/60R15 mounts on a 15-inch wheel, a plus-2 fitment from the 13-inch wheel of 165/80R13.

Size pages

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