215/65R15 vs 215/55R17

215/55R17 is 0.31 in (7.8 mm) taller than 215/65R15, a +1.18% diameter difference. With the speedometer set for 215/65R15, an indicated 60 mph is 60.7 mph on 215/55R17.

Is this a safe swap?

Diameter difference +1.18%: within the ±3% guideline

By overall diameter alone, 215/55R17 falls inside the ±3% range commonly used as a guideline when replacing 215/65R15. 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.

215/65R15 vs 215/55R17 differences
Measurement	215/65R15	215/55R17	Difference	% diff
Overall diameter	26.00 in (660.5 mm)	26.31 in (668.3 mm)	+0.31 in (+7.8 mm)	+1.18%
Sidewall height	5.50 in (139.8 mm)	4.66 in (118.3 mm)	−0.85 in (−21.5 mm)	−15.38%
Section width	8.46 in (215.0 mm)	8.46 in (215.0 mm)	0.00 in (0.0 mm)	0.00%
Circumference	81.69 in (2,075.0 mm)	82.66 in (2,099.5 mm)	+0.96 in (+24.5 mm)	+1.18%
Revolutions per mile	776	767	−9	−1.17%

True speed with the speedometer calibrated for 215/65R15
Indicated	Actual on 215/65R15	Actual on 215/55R17	Difference
30 mph	30.0 mph	30.4 mph	+0.4 mph
60 mph	60.0 mph	60.7 mph	+0.7 mph
75 mph	75.0 mph	75.9 mph	+0.9 mph

Ride-height change: 215/55R17 raises the vehicle by 0.15 in (3.9 mm) at the axle (half the +7.8 mm diameter difference).

215/55R17 is 0.31 in taller than 215/65R15 and the same width, a 1.18% difference in overall diameter.

With the speedometer calibrated for 215/65R15, an indicated 60 mph is actually 60.7 mph on 215/55R17, and revolutions per mile change from 776 to 767.

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

Size pages

Other comparisons with 215/65R15

Other comparisons with 215/55R17

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