TireSizesFinder

215/50R15 vs 185/60R15

185/60R15 is 0.28 in (7.0 mm) taller than 215/50R15, a +1.17% diameter difference. With the speedometer set for 215/50R15, an indicated 60 mph is 60.7 mph on 185/60R15.

Is this a safe swap?

Diameter difference +1.17%: within the ±3% guideline

By overall diameter alone, 185/60R15 falls inside the ±3% range commonly used as a guideline when replacing 215/50R15. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 215/50R15 (23.46 in) vs 185/60R15 (23.74 in)215/50R1523.46 in × 8.46 in185/60R1523.74 in × 7.28 in
Side profile and tread width, drawn to the same scale.
215/50R15 vs 185/60R15 differences
Measurement215/50R15185/60R15Difference% diff
Overall diameter23.46 in (596.0 mm)23.74 in (603.0 mm)+0.28 in (+7.0 mm)+1.17%
Sidewall height4.23 in (107.5 mm)4.37 in (111.0 mm)+0.14 in (+3.5 mm)+3.26%
Section width8.46 in (215.0 mm)7.28 in (185.0 mm)−1.18 in (−30.0 mm)−13.95%
Circumference73.72 in (1,872.4 mm)74.58 in (1,894.4 mm)+0.87 in (+22.0 mm)+1.17%
Revolutions per mile860850−10−1.16%
True speed with the speedometer calibrated for 215/50R15
IndicatedActual on 215/50R15Actual on 185/60R15Difference
30 mph30.0 mph30.4 mph+0.4 mph
60 mph60.0 mph60.7 mph+0.7 mph
75 mph75.0 mph75.9 mph+0.9 mph

Ride-height change: 185/60R15 raises the vehicle by 0.14 in (3.5 mm) at the axle (half the +7.0 mm diameter difference).

185/60R15 is 0.28 in taller than 215/50R15 and 30 mm narrower, a 1.17% difference in overall diameter.

With the speedometer calibrated for 215/50R15, an indicated 60 mph is actually 60.7 mph on 185/60R15, and revolutions per mile change from 860 to 850.

Both sizes mount on 15-inch wheels.

Size pages

Other comparisons with 215/50R15

Other comparisons with 185/60R15

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