TireSizesFinder

175/80R13 vs 185/65R14

185/65R14 is 0.56 in (14.1 mm) shorter than 175/80R13, a −2.31% diameter difference. With the speedometer set for 175/80R13, an indicated 60 mph is 58.6 mph on 185/65R14.

Is this a safe swap?

Diameter difference −2.31%: within the ±3% guideline

By overall diameter alone, 185/65R14 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 185/65R14 (23.47 in)175/80R1324.02 in × 6.89 in185/65R1423.47 in × 7.28 in
Side profile and tread width, drawn to the same scale.
175/80R13 vs 185/65R14 differences
Measurement175/80R13185/65R14Difference% diff
Overall diameter24.02 in (610.2 mm)23.47 in (596.1 mm)−0.56 in (−14.1 mm)−2.31%
Sidewall height5.51 in (140.0 mm)4.73 in (120.3 mm)−0.78 in (−19.7 mm)−14.11%
Section width6.89 in (175.0 mm)7.28 in (185.0 mm)+0.39 in (+10.0 mm)+5.71%
Circumference75.47 in (1,917.0 mm)73.73 in (1,872.7 mm)−1.74 in (−44.3 mm)−2.31%
Revolutions per mile840859+20+2.37%
True speed with the speedometer calibrated for 175/80R13
IndicatedActual on 175/80R13Actual on 185/65R14Difference
30 mph30.0 mph29.3 mph−0.7 mph
60 mph60.0 mph58.6 mph−1.4 mph
75 mph75.0 mph73.3 mph−1.7 mph

Ride-height change: 185/65R14 lowers the vehicle by 0.28 in (7.1 mm) at the axle (half the −14.1 mm diameter difference).

185/65R14 is 0.56 in shorter than 175/80R13 and 10 mm wider, a 2.31% difference in overall diameter.

With the speedometer calibrated for 175/80R13, an indicated 60 mph is actually 58.6 mph on 185/65R14, and revolutions per mile change from 840 to 859.

185/65R14 mounts on a 14-inch wheel, a plus-1 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.