175/80R13 vs 185/70R14

185/70R14 is 0.17 in (4.4 mm) taller than 175/80R13, a +0.72% diameter difference. With the speedometer set for 175/80R13, an indicated 60 mph is 60.4 mph on 185/70R14.

Is this a safe swap?

Diameter difference +0.72%: under 1%

By overall diameter alone, 185/70R14 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.

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

175/80R13 vs 185/70R14 differences
Measurement	175/80R13	185/70R14	Difference	% diff
Overall diameter	24.02 in (610.2 mm)	24.20 in (614.6 mm)	+0.17 in (+4.4 mm)	+0.72%
Sidewall height	5.51 in (140.0 mm)	5.10 in (129.5 mm)	−0.41 in (−10.5 mm)	−7.50%
Section width	6.89 in (175.0 mm)	7.28 in (185.0 mm)	+0.39 in (+10.0 mm)	+5.71%
Circumference	75.47 in (1,917.0 mm)	76.02 in (1,930.8 mm)	+0.54 in (+13.8 mm)	+0.72%
Revolutions per mile	840	834	−6	−0.72%

True speed with the speedometer calibrated for 175/80R13
Indicated	Actual on 175/80R13	Actual on 185/70R14	Difference
30 mph	30.0 mph	30.2 mph	+0.2 mph
60 mph	60.0 mph	60.4 mph	+0.4 mph
75 mph	75.0 mph	75.5 mph	+0.5 mph

Ride-height change: 185/70R14 raises the vehicle by 0.09 in (2.2 mm) at the axle (half the +4.4 mm diameter difference).

185/70R14 is 0.17 in taller than 175/80R13 and 10 mm wider, a 0.72% difference in overall diameter.

With the speedometer calibrated for 175/80R13, an indicated 60 mph is actually 60.4 mph on 185/70R14, and revolutions per mile change from 840 to 834.

185/70R14 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 185/70R14

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