TireSizesFinder

175/80R13 vs 165/65R15

165/65R15 is 0.58 in (14.7 mm) shorter than 175/80R13, a −2.41% diameter difference. With the speedometer set for 175/80R13, an indicated 60 mph is 58.6 mph on 165/65R15.

Is this a safe swap?

Diameter difference −2.41%: within the ±3% guideline

By overall diameter alone, 165/65R15 falls inside the ±3% range commonly used as a guideline when replacing 175/80R13. 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 165/65R15 (23.44 in)175/80R1324.02 in × 6.89 in165/65R1523.44 in × 6.50 in
Side profile and tread width, drawn to the same scale.
175/80R13 vs 165/65R15 differences
Measurement175/80R13165/65R15Difference% diff
Overall diameter24.02 in (610.2 mm)23.44 in (595.5 mm)−0.58 in (−14.7 mm)−2.41%
Sidewall height5.51 in (140.0 mm)4.22 in (107.3 mm)−1.29 in (−32.7 mm)−23.39%
Section width6.89 in (175.0 mm)6.50 in (165.0 mm)−0.39 in (−10.0 mm)−5.71%
Circumference75.47 in (1,917.0 mm)73.65 in (1,870.8 mm)−1.82 in (−46.2 mm)−2.41%
Revolutions per mile840860+21+2.47%
True speed with the speedometer calibrated for 175/80R13
IndicatedActual on 175/80R13Actual on 165/65R15Difference
30 mph30.0 mph29.3 mph−0.7 mph
60 mph60.0 mph58.6 mph−1.4 mph
75 mph75.0 mph73.2 mph−1.8 mph

Ride-height change: 165/65R15 lowers the vehicle by 0.29 in (7.4 mm) at the axle (half the −14.7 mm diameter difference).

165/65R15 is 0.58 in shorter than 175/80R13 and 10 mm narrower, a 2.41% difference in overall diameter.

With the speedometer calibrated for 175/80R13, an indicated 60 mph is actually 58.6 mph on 165/65R15, and revolutions per mile change from 840 to 860.

165/65R15 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.