175/80R13 vs 175/70R14

175/70R14 is 0.38 in (9.6 mm) shorter than 175/80R13, a −1.57% diameter difference. With the speedometer set for 175/80R13, an indicated 60 mph is 59.1 mph on 175/70R14.

Is this a safe swap?

Diameter difference −1.57%: within the ±3% guideline

By overall diameter alone, 175/70R14 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.

Side profile and tread width, drawn to the same scale.

175/80R13 vs 175/70R14 differences
Measurement	175/80R13	175/70R14	Difference	% diff
Overall diameter	24.02 in (610.2 mm)	23.65 in (600.6 mm)	−0.38 in (−9.6 mm)	−1.57%
Sidewall height	5.51 in (140.0 mm)	4.82 in (122.5 mm)	−0.69 in (−17.5 mm)	−12.50%
Section width	6.89 in (175.0 mm)	6.89 in (175.0 mm)	0.00 in (0.0 mm)	0.00%
Circumference	75.47 in (1,917.0 mm)	74.29 in (1,886.8 mm)	−1.19 in (−30.2 mm)	−1.57%
Revolutions per mile	840	853	+13	+1.60%

True speed with the speedometer calibrated for 175/80R13
Indicated	Actual on 175/80R13	Actual on 175/70R14	Difference
30 mph	30.0 mph	29.5 mph	−0.5 mph
60 mph	60.0 mph	59.1 mph	−0.9 mph
75 mph	75.0 mph	73.8 mph	−1.2 mph

Ride-height change: 175/70R14 lowers the vehicle by 0.19 in (4.8 mm) at the axle (half the −9.6 mm diameter difference).

175/70R14 is 0.38 in shorter than 175/80R13 and the same width, a 1.57% difference in overall diameter.

With the speedometer calibrated for 175/80R13, an indicated 60 mph is actually 59.1 mph on 175/70R14, and revolutions per mile change from 840 to 853.

175/70R14 mounts on a 14-inch wheel, a plus-1 fitment from the 13-inch wheel of 175/80R13.

Size pages

Other comparisons with 175/80R13

Other comparisons with 175/70R14

Source: Calculated from standard tire geometry formulas. Verified 2026-09-27. How these numbers are calculated.