215/75R14 vs 215/70R15

215/70R15 is 0.15 in (3.9 mm) taller than 215/75R14, a +0.58% diameter difference. With the speedometer set for 215/75R14, an indicated 60 mph is 60.3 mph on 215/70R15.

Is this a safe swap?

Diameter difference +0.58%: under 1%

By overall diameter alone, 215/70R15 is a near match for 215/75R14; 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.

215/75R14 vs 215/70R15 differences
Measurement	215/75R14	215/70R15	Difference	% diff
Overall diameter	26.70 in (678.1 mm)	26.85 in (682.0 mm)	+0.15 in (+3.9 mm)	+0.58%
Sidewall height	6.35 in (161.3 mm)	5.93 in (150.5 mm)	−0.42 in (−10.7 mm)	−6.67%
Section width	8.46 in (215.0 mm)	8.46 in (215.0 mm)	0.00 in (0.0 mm)	0.00%
Circumference	83.87 in (2,130.3 mm)	84.35 in (2,142.6 mm)	+0.48 in (+12.3 mm)	+0.58%
Revolutions per mile	755	751	−4	−0.57%

True speed with the speedometer calibrated for 215/75R14
Indicated	Actual on 215/75R14	Actual on 215/70R15	Difference
30 mph	30.0 mph	30.2 mph	+0.2 mph
60 mph	60.0 mph	60.3 mph	+0.3 mph
75 mph	75.0 mph	75.4 mph	+0.4 mph

Ride-height change: 215/70R15 raises the vehicle by 0.08 in (2.0 mm) at the axle (half the +3.9 mm diameter difference).

215/70R15 is 0.15 in taller than 215/75R14 and the same width, a 0.58% difference in overall diameter.

With the speedometer calibrated for 215/75R14, an indicated 60 mph is actually 60.3 mph on 215/70R15, and revolutions per mile change from 755 to 751.

215/70R15 mounts on a 15-inch wheel, a plus-1 fitment from the 14-inch wheel of 215/75R14.

Size pages

Other comparisons with 215/75R14

Other comparisons with 215/70R15

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