185/70R13 vs 175/70R14

175/70R14 is 0.45 in (11.4 mm) taller than 185/70R13, a +1.93% diameter difference. With the speedometer set for 185/70R13, an indicated 60 mph is 61.2 mph on 175/70R14.

Is this a safe swap?

Diameter difference +1.93%: within the ±3% guideline

By overall diameter alone, 175/70R14 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.

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

185/70R13 vs 175/70R14 differences
Measurement	185/70R13	175/70R14	Difference	% diff
Overall diameter	23.20 in (589.2 mm)	23.65 in (600.6 mm)	+0.45 in (+11.4 mm)	+1.93%
Sidewall height	5.10 in (129.5 mm)	4.82 in (122.5 mm)	−0.28 in (−7.0 mm)	−5.41%
Section width	7.28 in (185.0 mm)	6.89 in (175.0 mm)	−0.39 in (−10.0 mm)	−5.41%
Circumference	72.88 in (1,851.0 mm)	74.29 in (1,886.8 mm)	+1.41 in (+35.8 mm)	+1.93%
Revolutions per mile	869	853	−17	−1.90%

True speed with the speedometer calibrated for 185/70R13
Indicated	Actual on 185/70R13	Actual on 175/70R14	Difference
30 mph	30.0 mph	30.6 mph	+0.6 mph
60 mph	60.0 mph	61.2 mph	+1.2 mph
75 mph	75.0 mph	76.5 mph	+1.5 mph

Ride-height change: 175/70R14 raises the vehicle by 0.22 in (5.7 mm) at the axle (half the +11.4 mm diameter difference).

175/70R14 is 0.45 in taller than 185/70R13 and 10 mm narrower, a 1.93% difference in overall diameter.

With the speedometer calibrated for 185/70R13, an indicated 60 mph is actually 61.2 mph on 175/70R14, and revolutions per mile change from 869 to 853.

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

Size pages

Other comparisons with 185/70R13

Other comparisons with 175/70R14

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