175/70R13 vs 195/50R15

195/50R15 is 0.03 in (0.8 mm) taller than 175/70R13, a +0.14% diameter difference. With the speedometer set for 175/70R13, an indicated 60 mph is 60.1 mph on 195/50R15.

Is this a safe swap?

Diameter difference +0.14%: under 1%

By overall diameter alone, 195/50R15 is a near match for 175/70R13; 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.

175/70R13 vs 195/50R15 differences
Measurement	175/70R13	195/50R15	Difference	% diff
Overall diameter	22.65 in (575.2 mm)	22.68 in (576.0 mm)	+0.03 in (+0.8 mm)	+0.14%
Sidewall height	4.82 in (122.5 mm)	3.84 in (97.5 mm)	−0.98 in (−25.0 mm)	−20.41%
Section width	6.89 in (175.0 mm)	7.68 in (195.0 mm)	+0.79 in (+20.0 mm)	+11.43%
Circumference	71.14 in (1,807.0 mm)	71.24 in (1,809.6 mm)	+0.10 in (+2.5 mm)	+0.14%
Revolutions per mile	891	889	−1	−0.14%

True speed with the speedometer calibrated for 175/70R13
Indicated	Actual on 175/70R13	Actual on 195/50R15	Difference
30 mph	30.0 mph	30.0 mph	0.0 mph
60 mph	60.0 mph	60.1 mph	+0.1 mph
75 mph	75.0 mph	75.1 mph	+0.1 mph

Ride-height change: 195/50R15 raises the vehicle by 0.02 in (0.4 mm) at the axle (half the +0.8 mm diameter difference).

195/50R15 is 0.03 in taller than 175/70R13 and 20 mm wider, a 0.14% difference in overall diameter.

With the speedometer calibrated for 175/70R13, an indicated 60 mph is actually 60.1 mph on 195/50R15, and revolutions per mile change from 891 to 889.

195/50R15 mounts on a 15-inch wheel, a plus-2 fitment from the 13-inch wheel of 175/70R13.

Size pages

Other comparisons with 175/70R13

Other comparisons with 195/50R15

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