165/65R14 vs 195/50R15

195/50R15 is 0.23 in (5.9 mm) taller than 165/65R14, a +1.03% diameter difference. With the speedometer set for 165/65R14, an indicated 60 mph is 60.6 mph on 195/50R15.

Is this a safe swap?

Diameter difference +1.03%: within the ±3% guideline

By overall diameter alone, 195/50R15 falls inside the ±3% range commonly used as a guideline when replacing 165/65R14. 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.

165/65R14 vs 195/50R15 differences
Measurement	165/65R14	195/50R15	Difference	% diff
Overall diameter	22.44 in (570.1 mm)	22.68 in (576.0 mm)	+0.23 in (+5.9 mm)	+1.03%
Sidewall height	4.22 in (107.3 mm)	3.84 in (97.5 mm)	−0.38 in (−9.7 mm)	−9.09%
Section width	6.50 in (165.0 mm)	7.68 in (195.0 mm)	+1.18 in (+30.0 mm)	+18.18%
Circumference	70.51 in (1,791.0 mm)	71.24 in (1,809.6 mm)	+0.73 in (+18.5 mm)	+1.03%
Revolutions per mile	899	889	−9	−1.02%

True speed with the speedometer calibrated for 165/65R14
Indicated	Actual on 165/65R14	Actual on 195/50R15	Difference
30 mph	30.0 mph	30.3 mph	+0.3 mph
60 mph	60.0 mph	60.6 mph	+0.6 mph
75 mph	75.0 mph	75.8 mph	+0.8 mph

Ride-height change: 195/50R15 raises the vehicle by 0.12 in (3.0 mm) at the axle (half the +5.9 mm diameter difference).

195/50R15 is 0.23 in taller than 165/65R14 and 30 mm wider, a 1.03% difference in overall diameter.

With the speedometer calibrated for 165/65R14, an indicated 60 mph is actually 60.6 mph on 195/50R15, and revolutions per mile change from 899 to 889.

195/50R15 mounts on a 15-inch wheel, a plus-1 fitment from the 14-inch wheel of 165/65R14.

Size pages

Other comparisons with 165/65R14

Other comparisons with 195/50R15

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