TireSizesFinder

185/60R13 vs 155/80R13

155/80R13 is 1.02 in (26.0 mm) taller than 185/60R13, a +4.71% diameter difference. With the speedometer set for 185/60R13, an indicated 60 mph is 62.8 mph on 155/80R13.

Is this a safe swap?

Diameter difference +4.71%: outside the ±3% guideline

By overall diameter alone, 155/80R13 falls outside the ±3% range commonly used as a guideline when replacing 185/60R13; speedometer and ride-height changes are larger. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 185/60R13 (21.74 in) vs 155/80R13 (22.76 in)185/60R1321.74 in × 7.28 in155/80R1322.76 in × 6.10 in
Side profile and tread width, drawn to the same scale.
185/60R13 vs 155/80R13 differences
Measurement185/60R13155/80R13Difference% diff
Overall diameter21.74 in (552.2 mm)22.76 in (578.2 mm)+1.02 in (+26.0 mm)+4.71%
Sidewall height4.37 in (111.0 mm)4.88 in (124.0 mm)+0.51 in (+13.0 mm)+11.71%
Section width7.28 in (185.0 mm)6.10 in (155.0 mm)−1.18 in (−30.0 mm)−16.22%
Circumference68.30 in (1,734.8 mm)71.51 in (1,816.5 mm)+3.22 in (+81.7 mm)+4.71%
Revolutions per mile928886−42−4.50%
True speed with the speedometer calibrated for 185/60R13
IndicatedActual on 185/60R13Actual on 155/80R13Difference
30 mph30.0 mph31.4 mph+1.4 mph
60 mph60.0 mph62.8 mph+2.8 mph
75 mph75.0 mph78.5 mph+3.5 mph

Ride-height change: 155/80R13 raises the vehicle by 0.51 in (13.0 mm) at the axle (half the +26.0 mm diameter difference).

155/80R13 is 1.02 in taller than 185/60R13 and 30 mm narrower, a 4.71% difference in overall diameter.

With the speedometer calibrated for 185/60R13, an indicated 60 mph is actually 62.8 mph on 155/80R13, and revolutions per mile change from 928 to 886.

Both sizes mount on 13-inch wheels.

Size pages

Other comparisons with 185/60R13

Other comparisons with 155/80R13

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