165/70R14 vs 195/50R15

195/50R15 is 0.42 in (10.6 mm) shorter than 165/70R14, a −1.81% diameter difference. With the speedometer set for 165/70R14, an indicated 60 mph is 58.9 mph on 195/50R15.

Is this a safe swap?

Diameter difference −1.81%: within the ±3% guideline

By overall diameter alone, 195/50R15 falls inside the ±3% range commonly used as a guideline when replacing 165/70R14. 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.

165/70R14 vs 195/50R15 differences
Measurement	165/70R14	195/50R15	Difference	% diff
Overall diameter	23.09 in (586.6 mm)	22.68 in (576.0 mm)	−0.42 in (−10.6 mm)	−1.81%
Sidewall height	4.55 in (115.5 mm)	3.84 in (97.5 mm)	−0.71 in (−18.0 mm)	−15.58%
Section width	6.50 in (165.0 mm)	7.68 in (195.0 mm)	+1.18 in (+30.0 mm)	+18.18%
Circumference	72.55 in (1,842.9 mm)	71.24 in (1,809.6 mm)	−1.31 in (−33.3 mm)	−1.81%
Revolutions per mile	873	889	+16	+1.84%

True speed with the speedometer calibrated for 165/70R14
Indicated	Actual on 165/70R14	Actual on 195/50R15	Difference
30 mph	30.0 mph	29.5 mph	−0.5 mph
60 mph	60.0 mph	58.9 mph	−1.1 mph
75 mph	75.0 mph	73.6 mph	−1.4 mph

Ride-height change: 195/50R15 lowers the vehicle by 0.21 in (5.3 mm) at the axle (half the −10.6 mm diameter difference).

195/50R15 is 0.42 in shorter than 165/70R14 and 30 mm wider, a 1.81% difference in overall diameter.

With the speedometer calibrated for 165/70R14, an indicated 60 mph is actually 58.9 mph on 195/50R15, and revolutions per mile change from 873 to 889.

195/50R15 mounts on a 15-inch wheel, a plus-1 fitment from the 14-inch wheel of 165/70R14.

Size pages

Other comparisons with 165/70R14

Other comparisons with 195/50R15

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