225/50R16 vs 225/45R17

225/45R17 is 0.11 in (2.9 mm) taller than 225/50R16, a +0.46% diameter difference. With the speedometer set for 225/50R16, an indicated 60 mph is 60.3 mph on 225/45R17.

Is this a safe swap?

Diameter difference +0.46%: under 1%

By overall diameter alone, 225/45R17 is a near match for 225/50R16; 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.

225/50R16 vs 225/45R17 differences
Measurement	225/50R16	225/45R17	Difference	% diff
Overall diameter	24.86 in (631.4 mm)	24.97 in (634.3 mm)	+0.11 in (+2.9 mm)	+0.46%
Sidewall height	4.43 in (112.5 mm)	3.99 in (101.3 mm)	−0.44 in (−11.2 mm)	−10.00%
Section width	8.86 in (225.0 mm)	8.86 in (225.0 mm)	0.00 in (0.0 mm)	0.00%
Circumference	78.09 in (1,983.6 mm)	78.45 in (1,992.7 mm)	+0.36 in (+9.1 mm)	+0.46%
Revolutions per mile	811	808	−4	−0.46%

True speed with the speedometer calibrated for 225/50R16
Indicated	Actual on 225/50R16	Actual on 225/45R17	Difference
30 mph	30.0 mph	30.1 mph	+0.1 mph
60 mph	60.0 mph	60.3 mph	+0.3 mph
75 mph	75.0 mph	75.3 mph	+0.3 mph

Ride-height change: 225/45R17 raises the vehicle by 0.06 in (1.4 mm) at the axle (half the +2.9 mm diameter difference).

225/45R17 is 0.11 in taller than 225/50R16 and the same width, a 0.46% difference in overall diameter.

With the speedometer calibrated for 225/50R16, an indicated 60 mph is actually 60.3 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 225/50R16.

Size pages

Other comparisons with 225/50R16

Other comparisons with 225/45R17

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