155/80R13 vs 175/60R15

175/60R15 is 0.50 in (12.8 mm) taller than 155/80R13, a +2.21% diameter difference. With the speedometer set for 155/80R13, an indicated 60 mph is 61.3 mph on 175/60R15.

Is this a safe swap?

Diameter difference +2.21%: within the ±3% guideline

By overall diameter alone, 175/60R15 falls inside the ±3% range commonly used as a guideline when replacing 155/80R13. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

Side profile and tread width, drawn to the same scale.

155/80R13 vs 175/60R15 differences
Measurement	155/80R13	175/60R15	Difference	% diff
Overall diameter	22.76 in (578.2 mm)	23.27 in (591.0 mm)	+0.50 in (+12.8 mm)	+2.21%
Sidewall height	4.88 in (124.0 mm)	4.13 in (105.0 mm)	−0.75 in (−19.0 mm)	−15.32%
Section width	6.10 in (155.0 mm)	6.89 in (175.0 mm)	+0.79 in (+20.0 mm)	+12.90%
Circumference	71.51 in (1,816.5 mm)	73.10 in (1,856.7 mm)	+1.58 in (+40.2 mm)	+2.21%
Revolutions per mile	886	867	−19	−2.17%

True speed with the speedometer calibrated for 155/80R13
Indicated	Actual on 155/80R13	Actual on 175/60R15	Difference
30 mph	30.0 mph	30.7 mph	+0.7 mph
60 mph	60.0 mph	61.3 mph	+1.3 mph
75 mph	75.0 mph	76.7 mph	+1.7 mph

Ride-height change: 175/60R15 raises the vehicle by 0.25 in (6.4 mm) at the axle (half the +12.8 mm diameter difference).

175/60R15 is 0.50 in taller than 155/80R13 and 20 mm wider, a 2.21% difference in overall diameter.

With the speedometer calibrated for 155/80R13, an indicated 60 mph is actually 61.3 mph on 175/60R15, and revolutions per mile change from 886 to 867.

175/60R15 mounts on a 15-inch wheel, a plus-2 fitment from the 13-inch wheel of 155/80R13.

Size pages

Other comparisons with 155/80R13

Other comparisons with 175/60R15

Source: Calculated from standard tire geometry formulas. Verified 2026-09-27. How these numbers are calculated.