205/55R16 vs 225/45R17

225/45R17 is 0.09 in (2.4 mm) taller than 205/55R16, a +0.38% diameter difference. With the speedometer set for 205/55R16, an indicated 60 mph is 60.2 mph on 225/45R17.

Is this a safe swap?

Diameter difference +0.38%: under 1%

By overall diameter alone, 225/45R17 is a near match for 205/55R16; 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.

205/55R16 vs 225/45R17 differences
Measurement	205/55R16	225/45R17	Difference	% diff
Overall diameter	24.88 in (631.9 mm)	24.97 in (634.3 mm)	+0.09 in (+2.4 mm)	+0.38%
Sidewall height	4.44 in (112.8 mm)	3.99 in (101.3 mm)	−0.45 in (−11.5 mm)	−10.20%
Section width	8.07 in (205.0 mm)	8.86 in (225.0 mm)	+0.79 in (+20.0 mm)	+9.76%
Circumference	78.16 in (1,985.2 mm)	78.45 in (1,992.7 mm)	+0.30 in (+7.5 mm)	+0.38%
Revolutions per mile	811	808	−3	−0.38%

True speed with the speedometer calibrated for 205/55R16
Indicated	Actual on 205/55R16	Actual on 225/45R17	Difference
30 mph	30.0 mph	30.1 mph	+0.1 mph
60 mph	60.0 mph	60.2 mph	+0.2 mph
75 mph	75.0 mph	75.3 mph	+0.3 mph

Ride-height change: 225/45R17 raises the vehicle by 0.05 in (1.2 mm) at the axle (half the +2.4 mm diameter difference).

225/45R17 is 0.09 in taller than 205/55R16 and 20 mm wider, a 0.38% difference in overall diameter.

With the speedometer calibrated for 205/55R16, an indicated 60 mph is actually 60.2 mph on 225/45R17, and revolutions per mile change from 811 to 808.

225/45R17 mounts on a 17-inch wheel, a plus-1 fitment from the 16-inch wheel of 205/55R16.

Size pages

Other comparisons with 205/55R16

Other comparisons with 225/45R17

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