225/65R15 vs 215/55R17

215/55R17 is 0.20 in (5.2 mm) shorter than 225/65R15, a −0.77% diameter difference. With the speedometer set for 225/65R15, an indicated 60 mph is 59.5 mph on 215/55R17.

Is this a safe swap?

Diameter difference −0.77%: under 1%

By overall diameter alone, 215/55R17 is a near match for 225/65R15; 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.

225/65R15 vs 215/55R17 differences
Measurement	225/65R15	215/55R17	Difference	% diff
Overall diameter	26.52 in (673.5 mm)	26.31 in (668.3 mm)	−0.20 in (−5.2 mm)	−0.77%
Sidewall height	5.76 in (146.3 mm)	4.66 in (118.3 mm)	−1.10 in (−28.0 mm)	−19.15%
Section width	8.86 in (225.0 mm)	8.46 in (215.0 mm)	−0.39 in (−10.0 mm)	−4.44%
Circumference	83.30 in (2,115.9 mm)	82.66 in (2,099.5 mm)	−0.64 in (−16.3 mm)	−0.77%
Revolutions per mile	761	767	+6	+0.78%

True speed with the speedometer calibrated for 225/65R15
Indicated	Actual on 225/65R15	Actual on 215/55R17	Difference
30 mph	30.0 mph	29.8 mph	−0.2 mph
60 mph	60.0 mph	59.5 mph	−0.5 mph
75 mph	75.0 mph	74.4 mph	−0.6 mph

Ride-height change: 215/55R17 lowers the vehicle by 0.10 in (2.6 mm) at the axle (half the −5.2 mm diameter difference).

215/55R17 is 0.20 in shorter than 225/65R15 and 10 mm narrower, a 0.77% difference in overall diameter.

With the speedometer calibrated for 225/65R15, an indicated 60 mph is actually 59.5 mph on 215/55R17, and revolutions per mile change from 761 to 767.

215/55R17 mounts on a 17-inch wheel, a plus-2 fitment from the 15-inch wheel of 225/65R15.

Size pages

Other comparisons with 225/65R15

Other comparisons with 215/55R17

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