205/45R17 vs 225/45R17

225/45R17 is 0.71 in (18.0 mm) taller than 205/45R17, a +2.92% diameter difference. With the speedometer set for 205/45R17, an indicated 60 mph is 61.8 mph on 225/45R17.

Is this a safe swap?

Diameter difference +2.92%: within the ±3% guideline

By overall diameter alone, 225/45R17 falls inside the ±3% range commonly used as a guideline when replacing 205/45R17. 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.

205/45R17 vs 225/45R17 differences
Measurement	205/45R17	225/45R17	Difference	% diff
Overall diameter	24.26 in (616.3 mm)	24.97 in (634.3 mm)	+0.71 in (+18.0 mm)	+2.92%
Sidewall height	3.63 in (92.3 mm)	3.99 in (101.3 mm)	+0.35 in (+9.0 mm)	+9.76%
Section width	8.07 in (205.0 mm)	8.86 in (225.0 mm)	+0.79 in (+20.0 mm)	+9.76%
Circumference	76.23 in (1,936.2 mm)	78.45 in (1,992.7 mm)	+2.23 in (+56.5 mm)	+2.92%
Revolutions per mile	831	808	−24	−2.84%

True speed with the speedometer calibrated for 205/45R17
Indicated	Actual on 205/45R17	Actual on 225/45R17	Difference
30 mph	30.0 mph	30.9 mph	+0.9 mph
60 mph	60.0 mph	61.8 mph	+1.8 mph
75 mph	75.0 mph	77.2 mph	+2.2 mph

Ride-height change: 225/45R17 raises the vehicle by 0.35 in (9.0 mm) at the axle (half the +18.0 mm diameter difference).

225/45R17 is 0.71 in taller than 205/45R17 and 20 mm wider, a 2.92% difference in overall diameter.

With the speedometer calibrated for 205/45R17, an indicated 60 mph is actually 61.8 mph on 225/45R17, and revolutions per mile change from 831 to 808.

Both sizes mount on 17-inch wheels.

Size pages

Other comparisons with 205/45R17

Other comparisons with 225/45R17

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