235/60R15 vs 205/55R17

205/55R17 is 0.22 in (5.7 mm) shorter than 235/60R15, a −0.86% diameter difference. With the speedometer set for 235/60R15, an indicated 60 mph is 59.5 mph on 205/55R17.

Is this a safe swap?

Diameter difference −0.86%: under 1%

By overall diameter alone, 205/55R17 is a near match for 235/60R15; 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.

235/60R15 vs 205/55R17 differences
Measurement	235/60R15	205/55R17	Difference	% diff
Overall diameter	26.10 in (663.0 mm)	25.88 in (657.3 mm)	−0.22 in (−5.7 mm)	−0.86%
Sidewall height	5.55 in (141.0 mm)	4.44 in (112.8 mm)	−1.11 in (−28.2 mm)	−20.04%
Section width	9.25 in (235.0 mm)	8.07 in (205.0 mm)	−1.18 in (−30.0 mm)	−12.77%
Circumference	82.00 in (2,082.9 mm)	81.30 in (2,065.0 mm)	−0.71 in (−17.9 mm)	−0.86%
Revolutions per mile	773	779	+7	+0.87%

True speed with the speedometer calibrated for 235/60R15
Indicated	Actual on 235/60R15	Actual on 205/55R17	Difference
30 mph	30.0 mph	29.7 mph	−0.3 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: 205/55R17 lowers the vehicle by 0.11 in (2.9 mm) at the axle (half the −5.7 mm diameter difference).

205/55R17 is 0.22 in shorter than 235/60R15 and 30 mm narrower, a 0.86% difference in overall diameter.

With the speedometer calibrated for 235/60R15, an indicated 60 mph is actually 59.5 mph on 205/55R17, and revolutions per mile change from 773 to 779.

205/55R17 mounts on a 17-inch wheel, a plus-2 fitment from the 15-inch wheel of 235/60R15.

Size pages

Other comparisons with 235/60R15

Other comparisons with 205/55R17

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