215/45R17 vs 225/45R17

225/45R17 is 0.35 in (9.0 mm) taller than 215/45R17, a +1.44% diameter difference. With the speedometer set for 215/45R17, an indicated 60 mph is 60.9 mph on 225/45R17.

Is this a safe swap?

Diameter difference +1.44%: within the ±3% guideline

By overall diameter alone, 225/45R17 falls inside the ±3% range commonly used as a guideline when replacing 215/45R17. 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.

215/45R17 vs 225/45R17 differences
Measurement	215/45R17	225/45R17	Difference	% diff
Overall diameter	24.62 in (625.3 mm)	24.97 in (634.3 mm)	+0.35 in (+9.0 mm)	+1.44%
Sidewall height	3.81 in (96.8 mm)	3.99 in (101.3 mm)	+0.18 in (+4.5 mm)	+4.65%
Section width	8.46 in (215.0 mm)	8.86 in (225.0 mm)	+0.39 in (+10.0 mm)	+4.65%
Circumference	77.34 in (1,964.4 mm)	78.45 in (1,992.7 mm)	+1.11 in (+28.3 mm)	+1.44%
Revolutions per mile	819	808	−12	−1.42%

True speed with the speedometer calibrated for 215/45R17
Indicated	Actual on 215/45R17	Actual on 225/45R17	Difference
30 mph	30.0 mph	30.4 mph	+0.4 mph
60 mph	60.0 mph	60.9 mph	+0.9 mph
75 mph	75.0 mph	76.1 mph	+1.1 mph

Ride-height change: 225/45R17 raises the vehicle by 0.18 in (4.5 mm) at the axle (half the +9.0 mm diameter difference).

225/45R17 is 0.35 in taller than 215/45R17 and 10 mm wider, a 1.44% difference in overall diameter.

With the speedometer calibrated for 215/45R17, an indicated 60 mph is actually 60.9 mph on 225/45R17, and revolutions per mile change from 819 to 808.

Both sizes mount on 17-inch wheels.

Size pages

Other comparisons with 215/45R17

Other comparisons with 225/45R17

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