TireSizesFinder

225/50R15 vs 215/45R16

215/45R16 is 0.24 in (6.1 mm) shorter than 225/50R15, a −1.01% diameter difference. With the speedometer set for 225/50R15, an indicated 60 mph is 59.4 mph on 215/45R16.

Is this a safe swap?

Diameter difference −1.01%: within the ±3% guideline

By overall diameter alone, 215/45R16 falls inside the ±3% range commonly used as a guideline when replacing 225/50R15. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 225/50R15 (23.86 in) vs 215/45R16 (23.62 in)225/50R1523.86 in × 8.86 in215/45R1623.62 in × 8.46 in
Side profile and tread width, drawn to the same scale.
225/50R15 vs 215/45R16 differences
Measurement225/50R15215/45R16Difference% diff
Overall diameter23.86 in (606.0 mm)23.62 in (599.9 mm)−0.24 in (−6.1 mm)−1.01%
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%
Circumference74.95 in (1,903.8 mm)74.20 in (1,884.6 mm)−0.75 in (−19.2 mm)−1.01%
Revolutions per mile845854+9+1.02%
True speed with the speedometer calibrated for 225/50R15
IndicatedActual on 225/50R15Actual on 215/45R16Difference
30 mph30.0 mph29.7 mph−0.3 mph
60 mph60.0 mph59.4 mph−0.6 mph
75 mph75.0 mph74.2 mph−0.8 mph

Ride-height change: 215/45R16 lowers the vehicle by 0.12 in (3.1 mm) at the axle (half the −6.1 mm diameter difference).

215/45R16 is 0.24 in shorter than 225/50R15 and 10 mm narrower, a 1.01% difference in overall diameter.

With the speedometer calibrated for 225/50R15, an indicated 60 mph is actually 59.4 mph on 215/45R16, and revolutions per mile change from 845 to 854.

215/45R16 mounts on a 16-inch wheel, a plus-1 fitment from the 15-inch wheel of 225/50R15.

Size pages

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