145/80R13 vs 195/50R15

195/50R15 is 0.54 in (13.8 mm) taller than 145/80R13, a +2.45% diameter difference. With the speedometer set for 145/80R13, an indicated 60 mph is 61.5 mph on 195/50R15.

Is this a safe swap?

Diameter difference +2.45%: within the ±3% guideline

By overall diameter alone, 195/50R15 falls inside the ±3% range commonly used as a guideline when replacing 145/80R13. 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.

145/80R13 vs 195/50R15 differences
Measurement	145/80R13	195/50R15	Difference	% diff
Overall diameter	22.13 in (562.2 mm)	22.68 in (576.0 mm)	+0.54 in (+13.8 mm)	+2.45%
Sidewall height	4.57 in (116.0 mm)	3.84 in (97.5 mm)	−0.73 in (−18.5 mm)	−15.95%
Section width	5.71 in (145.0 mm)	7.68 in (195.0 mm)	+1.97 in (+50.0 mm)	+34.48%
Circumference	69.54 in (1,766.2 mm)	71.24 in (1,809.6 mm)	+1.71 in (+43.4 mm)	+2.45%
Revolutions per mile	911	889	−22	−2.40%

True speed with the speedometer calibrated for 145/80R13
Indicated	Actual on 145/80R13	Actual on 195/50R15	Difference
30 mph	30.0 mph	30.7 mph	+0.7 mph
60 mph	60.0 mph	61.5 mph	+1.5 mph
75 mph	75.0 mph	76.8 mph	+1.8 mph

Ride-height change: 195/50R15 raises the vehicle by 0.27 in (6.9 mm) at the axle (half the +13.8 mm diameter difference).

195/50R15 is 0.54 in taller than 145/80R13 and 50 mm wider, a 2.45% difference in overall diameter.

With the speedometer calibrated for 145/80R13, an indicated 60 mph is actually 61.5 mph on 195/50R15, and revolutions per mile change from 911 to 889.

195/50R15 mounts on a 15-inch wheel, a plus-2 fitment from the 13-inch wheel of 145/80R13.

Size pages

Other comparisons with 145/80R13

Other comparisons with 195/50R15

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