TireSizesFinder

185/70R13 vs 175/65R14

175/65R14 is 0.24 in (6.1 mm) shorter than 185/70R13, a −1.04% diameter difference. With the speedometer set for 185/70R13, an indicated 60 mph is 59.4 mph on 175/65R14.

Is this a safe swap?

Diameter difference −1.04%: within the ±3% guideline

By overall diameter alone, 175/65R14 falls inside the ±3% range commonly used as a guideline when replacing 185/70R13. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 185/70R13 (23.20 in) vs 175/65R14 (22.96 in)185/70R1323.20 in × 7.28 in175/65R1422.96 in × 6.89 in
Side profile and tread width, drawn to the same scale.
185/70R13 vs 175/65R14 differences
Measurement185/70R13175/65R14Difference% diff
Overall diameter23.20 in (589.2 mm)22.96 in (583.1 mm)−0.24 in (−6.1 mm)−1.04%
Sidewall height5.10 in (129.5 mm)4.48 in (113.8 mm)−0.62 in (−15.7 mm)−12.16%
Section width7.28 in (185.0 mm)6.89 in (175.0 mm)−0.39 in (−10.0 mm)−5.41%
Circumference72.88 in (1,851.0 mm)72.12 in (1,831.9 mm)−0.75 in (−19.2 mm)−1.04%
Revolutions per mile869879+9+1.05%
True speed with the speedometer calibrated for 185/70R13
IndicatedActual on 185/70R13Actual on 175/65R14Difference
30 mph30.0 mph29.7 mph−0.3 mph
60 mph60.0 mph59.4 mph−0.6 mph
75 mph75.0 mph74.2 mph−0.8 mph

Ride-height change: 175/65R14 lowers the vehicle by 0.12 in (3.1 mm) at the axle (half the −6.1 mm diameter difference).

175/65R14 is 0.24 in shorter than 185/70R13 and 10 mm narrower, a 1.04% difference in overall diameter.

With the speedometer calibrated for 185/70R13, an indicated 60 mph is actually 59.4 mph on 175/65R14, and revolutions per mile change from 869 to 879.

175/65R14 mounts on a 14-inch wheel, a plus-1 fitment from the 13-inch wheel of 185/70R13.

Size pages

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