225/70R14 vs 215/65R15

215/65R15 is 0.40 in (10.1 mm) shorter than 225/70R14, a −1.51% diameter difference. With the speedometer set for 225/70R14, an indicated 60 mph is 59.1 mph on 215/65R15.

Is this a safe swap?

Diameter difference −1.51%: within the ±3% guideline

By overall diameter alone, 215/65R15 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 215/65R15 differences
Measurement	225/70R14	215/65R15	Difference	% diff
Overall diameter	26.40 in (670.6 mm)	26.00 in (660.5 mm)	−0.40 in (−10.1 mm)	−1.51%
Sidewall height	6.20 in (157.5 mm)	5.50 in (139.8 mm)	−0.70 in (−17.7 mm)	−11.27%
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)	81.69 in (2,075.0 mm)	−1.25 in (−31.7 mm)	−1.51%
Revolutions per mile	764	776	+12	+1.53%

True speed with the speedometer calibrated for 225/70R14
Indicated	Actual on 225/70R14	Actual on 215/65R15	Difference
30 mph	30.0 mph	29.5 mph	−0.5 mph
60 mph	60.0 mph	59.1 mph	−0.9 mph
75 mph	75.0 mph	73.9 mph	−1.1 mph

Ride-height change: 215/65R15 lowers the vehicle by 0.20 in (5.0 mm) at the axle (half the −10.1 mm diameter difference).

215/65R15 is 0.40 in shorter than 225/70R14 and 10 mm narrower, a 1.51% difference in overall diameter.

With the speedometer calibrated for 225/70R14, an indicated 60 mph is actually 59.1 mph on 215/65R15, and revolutions per mile change from 764 to 776.

215/65R15 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 215/65R15

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