TireSizesFinder

175/80R13 vs 205/55R15

205/55R15 is 0.15 in (3.7 mm) shorter than 175/80R13, a −0.61% diameter difference. With the speedometer set for 175/80R13, an indicated 60 mph is 59.6 mph on 205/55R15.

Is this a safe swap?

Diameter difference −0.61%: under 1%

By overall diameter alone, 205/55R15 is a near match for 175/80R13; the speedometer changes by less than 1%. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 175/80R13 (24.02 in) vs 205/55R15 (23.88 in)175/80R1324.02 in × 6.89 in205/55R1523.88 in × 8.07 in
Side profile and tread width, drawn to the same scale.
175/80R13 vs 205/55R15 differences
Measurement175/80R13205/55R15Difference% diff
Overall diameter24.02 in (610.2 mm)23.88 in (606.5 mm)−0.15 in (−3.7 mm)−0.61%
Sidewall height5.51 in (140.0 mm)4.44 in (112.8 mm)−1.07 in (−27.2 mm)−19.46%
Section width6.89 in (175.0 mm)8.07 in (205.0 mm)+1.18 in (+30.0 mm)+17.14%
Circumference75.47 in (1,917.0 mm)75.01 in (1,905.4 mm)−0.46 in (−11.6 mm)−0.61%
Revolutions per mile840845+5+0.61%
True speed with the speedometer calibrated for 175/80R13
IndicatedActual on 175/80R13Actual on 205/55R15Difference
30 mph30.0 mph29.8 mph−0.2 mph
60 mph60.0 mph59.6 mph−0.4 mph
75 mph75.0 mph74.5 mph−0.5 mph

Ride-height change: 205/55R15 lowers the vehicle by 0.07 in (1.9 mm) at the axle (half the −3.7 mm diameter difference).

205/55R15 is 0.15 in shorter than 175/80R13 and 30 mm wider, a 0.61% difference in overall diameter.

With the speedometer calibrated for 175/80R13, an indicated 60 mph is actually 59.6 mph on 205/55R15, and revolutions per mile change from 840 to 845.

205/55R15 mounts on a 15-inch wheel, a plus-2 fitment from the 13-inch wheel of 175/80R13.

Size pages

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