TireSizesFinder

175/80R13 vs 175/65R15

175/65R15 is 0.07 in (1.7 mm) shorter than 175/80R13, a −0.28% diameter difference. With the speedometer set for 175/80R13, an indicated 60 mph is 59.8 mph on 175/65R15.

Is this a safe swap?

Diameter difference −0.28%: under 1%

By overall diameter alone, 175/65R15 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 175/65R15 (23.96 in)175/80R1324.02 in × 6.89 in175/65R1523.96 in × 6.89 in
Side profile and tread width, drawn to the same scale.
175/80R13 vs 175/65R15 differences
Measurement175/80R13175/65R15Difference% diff
Overall diameter24.02 in (610.2 mm)23.96 in (608.5 mm)−0.07 in (−1.7 mm)−0.28%
Sidewall height5.51 in (140.0 mm)4.48 in (113.8 mm)−1.03 in (−26.2 mm)−18.75%
Section width6.89 in (175.0 mm)6.89 in (175.0 mm)0.00 in (0.0 mm)0.00%
Circumference75.47 in (1,917.0 mm)75.26 in (1,911.7 mm)−0.21 in (−5.3 mm)−0.28%
Revolutions per mile840842+2+0.28%
True speed with the speedometer calibrated for 175/80R13
IndicatedActual on 175/80R13Actual on 175/65R15Difference
30 mph30.0 mph29.9 mph−0.1 mph
60 mph60.0 mph59.8 mph−0.2 mph
75 mph75.0 mph74.8 mph−0.2 mph

Ride-height change: 175/65R15 lowers the vehicle by 0.03 in (0.9 mm) at the axle (half the −1.7 mm diameter difference).

175/65R15 is 0.07 in shorter than 175/80R13 and the same width, a 0.28% difference in overall diameter.

With the speedometer calibrated for 175/80R13, an indicated 60 mph is actually 59.8 mph on 175/65R15, and revolutions per mile change from 840 to 842.

175/65R15 mounts on a 15-inch wheel, a plus-2 fitment from the 13-inch wheel of 175/80R13.

Size pages

Other comparisons with 175/80R13

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