225/75R14 vs 215/75R15

215/75R15 is 0.41 in (10.4 mm) taller than 225/75R14, a +1.50% diameter difference. With the speedometer set for 225/75R14, an indicated 60 mph is 60.9 mph on 215/75R15.

Is this a safe swap?

Diameter difference +1.50%: within the ±3% guideline

By overall diameter alone, 215/75R15 falls inside the ±3% range commonly used as a guideline when replacing 225/75R14. 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.

225/75R14 vs 215/75R15 differences
Measurement	225/75R14	215/75R15	Difference	% diff
Overall diameter	27.29 in (693.1 mm)	27.70 in (703.5 mm)	+0.41 in (+10.4 mm)	+1.50%
Sidewall height	6.64 in (168.8 mm)	6.35 in (161.3 mm)	−0.30 in (−7.5 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	85.73 in (2,177.4 mm)	87.01 in (2,210.1 mm)	+1.29 in (+32.7 mm)	+1.50%
Revolutions per mile	739	728	−11	−1.48%

True speed with the speedometer calibrated for 225/75R14
Indicated	Actual on 225/75R14	Actual on 215/75R15	Difference
30 mph	30.0 mph	30.5 mph	+0.5 mph
60 mph	60.0 mph	60.9 mph	+0.9 mph
75 mph	75.0 mph	76.1 mph	+1.1 mph

Ride-height change: 215/75R15 raises the vehicle by 0.20 in (5.2 mm) at the axle (half the +10.4 mm diameter difference).

215/75R15 is 0.41 in taller than 225/75R14 and 10 mm narrower, a 1.50% difference in overall diameter.

With the speedometer calibrated for 225/75R14, an indicated 60 mph is actually 60.9 mph on 215/75R15, and revolutions per mile change from 739 to 728.

215/75R15 mounts on a 15-inch wheel, a plus-1 fitment from the 14-inch wheel of 225/75R14.

Size pages

Other comparisons with 225/75R14

Other comparisons with 215/75R15

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