195/75R14 vs 195/70R15

195/70R15 is 0.23 in (5.9 mm) taller than 195/75R14, a +0.91% diameter difference. With the speedometer set for 195/75R14, an indicated 60 mph is 60.5 mph on 195/70R15.

Is this a safe swap?

Diameter difference +0.91%: under 1%

By overall diameter alone, 195/70R15 is a near match for 195/75R14; the speedometer changes by less than 1%. 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 195/70R15 differences
Measurement	195/75R14	195/70R15	Difference	% diff
Overall diameter	25.52 in (648.1 mm)	25.75 in (654.0 mm)	+0.23 in (+5.9 mm)	+0.91%
Sidewall height	5.76 in (146.3 mm)	5.37 in (136.5 mm)	−0.38 in (−9.7 mm)	−6.67%
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)	80.89 in (2,054.6 mm)	+0.73 in (+18.5 mm)	+0.91%
Revolutions per mile	790	783	−7	−0.90%

True speed with the speedometer calibrated for 195/75R14
Indicated	Actual on 195/75R14	Actual on 195/70R15	Difference
30 mph	30.0 mph	30.3 mph	+0.3 mph
60 mph	60.0 mph	60.5 mph	+0.5 mph
75 mph	75.0 mph	75.7 mph	+0.7 mph

Ride-height change: 195/70R15 raises the vehicle by 0.12 in (3.0 mm) at the axle (half the +5.9 mm diameter difference).

195/70R15 is 0.23 in taller than 195/75R14 and the same width, a 0.91% difference in overall diameter.

With the speedometer calibrated for 195/75R14, an indicated 60 mph is actually 60.5 mph on 195/70R15, and revolutions per mile change from 790 to 783.

195/70R15 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 195/70R15

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