225/70R14 vs 215/70R15

215/70R15 is 0.45 in (11.4 mm) taller than 225/70R14, a +1.70% diameter difference. With the speedometer set for 225/70R14, an indicated 60 mph is 61.0 mph on 215/70R15.

Is this a safe swap?

Diameter difference +1.70%: within the ±3% guideline

By overall diameter alone, 215/70R15 falls inside the ±3% range commonly used as a guideline when replacing 225/70R14. 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.

225/70R14 vs 215/70R15 differences
Measurement	225/70R14	215/70R15	Difference	% diff
Overall diameter	26.40 in (670.6 mm)	26.85 in (682.0 mm)	+0.45 in (+11.4 mm)	+1.70%
Sidewall height	6.20 in (157.5 mm)	5.93 in (150.5 mm)	−0.28 in (−7.0 mm)	−4.44%
Section width	8.86 in (225.0 mm)	8.46 in (215.0 mm)	−0.39 in (−10.0 mm)	−4.44%
Circumference	82.94 in (2,106.8 mm)	84.35 in (2,142.6 mm)	+1.41 in (+35.8 mm)	+1.70%
Revolutions per mile	764	751	−13	−1.67%

True speed with the speedometer calibrated for 225/70R14
Indicated	Actual on 225/70R14	Actual on 215/70R15	Difference
30 mph	30.0 mph	30.5 mph	+0.5 mph
60 mph	60.0 mph	61.0 mph	+1.0 mph
75 mph	75.0 mph	76.3 mph	+1.3 mph

Ride-height change: 215/70R15 raises the vehicle by 0.22 in (5.7 mm) at the axle (half the +11.4 mm diameter difference).

215/70R15 is 0.45 in taller than 225/70R14 and 10 mm narrower, a 1.70% difference in overall diameter.

With the speedometer calibrated for 225/70R14, an indicated 60 mph is actually 61.0 mph on 215/70R15, and revolutions per mile change from 764 to 751.

215/70R15 mounts on a 15-inch wheel, a plus-1 fitment from the 14-inch wheel of 225/70R14.

Size pages

Other comparisons with 225/70R14

Other comparisons with 215/70R15

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