225/70R15 vs 215/75R15

215/75R15 is 0.30 in (7.5 mm) taller than 225/70R15, a +1.08% diameter difference. With the speedometer set for 225/70R15, an indicated 60 mph is 60.6 mph on 215/75R15.

Is this a safe swap?

Diameter difference +1.08%: within the ±3% guideline

By overall diameter alone, 215/75R15 falls inside the ±3% range commonly used as a guideline when replacing 225/70R15. 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.

225/70R15 vs 215/75R15 differences
Measurement	225/70R15	215/75R15	Difference	% diff
Overall diameter	27.40 in (696.0 mm)	27.70 in (703.5 mm)	+0.30 in (+7.5 mm)	+1.08%
Sidewall height	6.20 in (157.5 mm)	6.35 in (161.3 mm)	+0.15 in (+3.8 mm)	+2.38%
Section width	8.86 in (225.0 mm)	8.46 in (215.0 mm)	−0.39 in (−10.0 mm)	−4.44%
Circumference	86.08 in (2,186.5 mm)	87.01 in (2,210.1 mm)	+0.93 in (+23.6 mm)	+1.08%
Revolutions per mile	736	728	−8	−1.07%

True speed with the speedometer calibrated for 225/70R15
Indicated	Actual on 225/70R15	Actual on 215/75R15	Difference
30 mph	30.0 mph	30.3 mph	+0.3 mph
60 mph	60.0 mph	60.6 mph	+0.6 mph
75 mph	75.0 mph	75.8 mph	+0.8 mph

Ride-height change: 215/75R15 raises the vehicle by 0.15 in (3.8 mm) at the axle (half the +7.5 mm diameter difference).

215/75R15 is 0.30 in taller than 225/70R15 and 10 mm narrower, a 1.08% difference in overall diameter.

With the speedometer calibrated for 225/70R15, an indicated 60 mph is actually 60.6 mph on 215/75R15, and revolutions per mile change from 736 to 728.

Both sizes mount on 15-inch wheels.

Size pages

Other comparisons with 225/70R15

Other comparisons with 215/75R15

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