225/60R15 vs 195/70R15

195/70R15 is 0.12 in (3.0 mm) taller than 225/60R15, a +0.46% diameter difference. With the speedometer set for 225/60R15, an indicated 60 mph is 60.3 mph on 195/70R15.

Is this a safe swap?

Diameter difference +0.46%: under 1%

By overall diameter alone, 195/70R15 is a near match for 225/60R15; 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.

225/60R15 vs 195/70R15 differences
Measurement	225/60R15	195/70R15	Difference	% diff
Overall diameter	25.63 in (651.0 mm)	25.75 in (654.0 mm)	+0.12 in (+3.0 mm)	+0.46%
Sidewall height	5.31 in (135.0 mm)	5.37 in (136.5 mm)	+0.06 in (+1.5 mm)	+1.11%
Section width	8.86 in (225.0 mm)	7.68 in (195.0 mm)	−1.18 in (−30.0 mm)	−13.33%
Circumference	80.52 in (2,045.2 mm)	80.89 in (2,054.6 mm)	+0.37 in (+9.4 mm)	+0.46%
Revolutions per mile	787	783	−4	−0.46%

True speed with the speedometer calibrated for 225/60R15
Indicated	Actual on 225/60R15	Actual on 195/70R15	Difference
30 mph	30.0 mph	30.1 mph	+0.1 mph
60 mph	60.0 mph	60.3 mph	+0.3 mph
75 mph	75.0 mph	75.3 mph	+0.3 mph

Ride-height change: 195/70R15 raises the vehicle by 0.06 in (1.5 mm) at the axle (half the +3.0 mm diameter difference).

195/70R15 is 0.12 in taller than 225/60R15 and 30 mm narrower, a 0.46% difference in overall diameter.

With the speedometer calibrated for 225/60R15, an indicated 60 mph is actually 60.3 mph on 195/70R15, and revolutions per mile change from 787 to 783.

Both sizes mount on 15-inch wheels.

Size pages

Other comparisons with 225/60R15

Other comparisons with 195/70R15

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