175/65R14 vs 195/50R15

195/50R15 is 0.28 in (7.1 mm) shorter than 175/65R14, a −1.22% diameter difference. With the speedometer set for 175/65R14, an indicated 60 mph is 59.3 mph on 195/50R15.

Is this a safe swap?

Diameter difference −1.22%: within the ±3% guideline

By overall diameter alone, 195/50R15 falls inside the ±3% range commonly used as a guideline when replacing 175/65R14. 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.

175/65R14 vs 195/50R15 differences
Measurement	175/65R14	195/50R15	Difference	% diff
Overall diameter	22.96 in (583.1 mm)	22.68 in (576.0 mm)	−0.28 in (−7.1 mm)	−1.22%
Sidewall height	4.48 in (113.8 mm)	3.84 in (97.5 mm)	−0.64 in (−16.2 mm)	−14.29%
Section width	6.89 in (175.0 mm)	7.68 in (195.0 mm)	+0.79 in (+20.0 mm)	+11.43%
Circumference	72.12 in (1,831.9 mm)	71.24 in (1,809.6 mm)	−0.88 in (−22.3 mm)	−1.22%
Revolutions per mile	879	889	+11	+1.23%

True speed with the speedometer calibrated for 175/65R14
Indicated	Actual on 175/65R14	Actual on 195/50R15	Difference
30 mph	30.0 mph	29.6 mph	−0.4 mph
60 mph	60.0 mph	59.3 mph	−0.7 mph
75 mph	75.0 mph	74.1 mph	−0.9 mph

Ride-height change: 195/50R15 lowers the vehicle by 0.14 in (3.5 mm) at the axle (half the −7.1 mm diameter difference).

195/50R15 is 0.28 in shorter than 175/65R14 and 20 mm wider, a 1.22% difference in overall diameter.

With the speedometer calibrated for 175/65R14, an indicated 60 mph is actually 59.3 mph on 195/50R15, and revolutions per mile change from 879 to 889.

195/50R15 mounts on a 15-inch wheel, a plus-1 fitment from the 14-inch wheel of 175/65R14.

Size pages

Other comparisons with 175/65R14

Other comparisons with 195/50R15

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