TireSizesFinder

225/50R16 vs 215/45R17

215/45R17 is 0.24 in (6.1 mm) shorter than 225/50R16, a −0.97% diameter difference. With the speedometer set for 225/50R16, an indicated 60 mph is 59.4 mph on 215/45R17.

Is this a safe swap?

Diameter difference −0.97%: under 1%

By overall diameter alone, 215/45R17 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.

To-scale drawing: 225/50R16 (24.86 in) vs 215/45R17 (24.62 in)225/50R1624.86 in × 8.86 in215/45R1724.62 in × 8.46 in
Side profile and tread width, drawn to the same scale.
225/50R16 vs 215/45R17 differences
Measurement225/50R16215/45R17Difference% diff
Overall diameter24.86 in (631.4 mm)24.62 in (625.3 mm)−0.24 in (−6.1 mm)−0.97%
Sidewall height4.43 in (112.5 mm)3.81 in (96.8 mm)−0.62 in (−15.7 mm)−14.00%
Section width8.86 in (225.0 mm)8.46 in (215.0 mm)−0.39 in (−10.0 mm)−4.44%
Circumference78.09 in (1,983.6 mm)77.34 in (1,964.4 mm)−0.75 in (−19.2 mm)−0.97%
Revolutions per mile811819+8+0.98%
True speed with the speedometer calibrated for 225/50R16
IndicatedActual on 225/50R16Actual on 215/45R17Difference
30 mph30.0 mph29.7 mph−0.3 mph
60 mph60.0 mph59.4 mph−0.6 mph
75 mph75.0 mph74.3 mph−0.7 mph

Ride-height change: 215/45R17 lowers the vehicle by 0.12 in (3.1 mm) at the axle (half the −6.1 mm diameter difference).

215/45R17 is 0.24 in shorter than 225/50R16 and 10 mm narrower, a 0.97% difference in overall diameter.

With the speedometer calibrated for 225/50R16, an indicated 60 mph is actually 59.4 mph on 215/45R17, and revolutions per mile change from 811 to 819.

215/45R17 mounts on a 17-inch wheel, a plus-1 fitment from the 16-inch wheel of 225/50R16.

Size pages

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Source: Calculated from standard tire geometry formulas. Verified . How these numbers are calculated.