195/75R14 vs 195/65R15

195/65R15 is 0.54 in (13.6 mm) shorter than 195/75R14, a −2.10% diameter difference. With the speedometer set for 195/75R14, an indicated 60 mph is 58.7 mph on 195/65R15.

Is this a safe swap?

Diameter difference −2.10%: within the ±3% guideline

By overall diameter alone, 195/65R15 falls inside the ±3% range commonly used as a guideline when replacing 195/75R14. 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.

195/75R14 vs 195/65R15 differences
Measurement	195/75R14	195/65R15	Difference	% diff
Overall diameter	25.52 in (648.1 mm)	24.98 in (634.5 mm)	−0.54 in (−13.6 mm)	−2.10%
Sidewall height	5.76 in (146.3 mm)	4.99 in (126.8 mm)	−0.77 in (−19.5 mm)	−13.33%
Section width	7.68 in (195.0 mm)	7.68 in (195.0 mm)	0.00 in (0.0 mm)	0.00%
Circumference	80.16 in (2,036.1 mm)	78.48 in (1,993.3 mm)	−1.68 in (−42.7 mm)	−2.10%
Revolutions per mile	790	807	+17	+2.14%

True speed with the speedometer calibrated for 195/75R14
Indicated	Actual on 195/75R14	Actual on 195/65R15	Difference
30 mph	30.0 mph	29.4 mph	−0.6 mph
60 mph	60.0 mph	58.7 mph	−1.3 mph
75 mph	75.0 mph	73.4 mph	−1.6 mph

Ride-height change: 195/65R15 lowers the vehicle by 0.27 in (6.8 mm) at the axle (half the −13.6 mm diameter difference).

195/65R15 is 0.54 in shorter than 195/75R14 and the same width, a 2.10% difference in overall diameter.

With the speedometer calibrated for 195/75R14, an indicated 60 mph is actually 58.7 mph on 195/65R15, and revolutions per mile change from 790 to 807.

195/65R15 mounts on a 15-inch wheel, a plus-1 fitment from the 14-inch wheel of 195/75R14.

Size pages

Other comparisons with 195/75R14

Other comparisons with 195/65R15

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