TireSizesFinder

205/50R16 vs 215/40R17

215/40R17 is 0.30 in (7.6 mm) shorter than 205/50R16, a −1.24% diameter difference. With the speedometer set for 205/50R16, an indicated 60 mph is 59.3 mph on 215/40R17.

Is this a safe swap?

Diameter difference −1.24%: within the ±3% guideline

By overall diameter alone, 215/40R17 falls inside the ±3% range commonly used as a guideline when replacing 205/50R16. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 205/50R16 (24.07 in) vs 215/40R17 (23.77 in)205/50R1624.07 in × 8.07 in215/40R1723.77 in × 8.46 in
Side profile and tread width, drawn to the same scale.
205/50R16 vs 215/40R17 differences
Measurement205/50R16215/40R17Difference% diff
Overall diameter24.07 in (611.4 mm)23.77 in (603.8 mm)−0.30 in (−7.6 mm)−1.24%
Sidewall height4.04 in (102.5 mm)3.39 in (86.0 mm)−0.65 in (−16.5 mm)−16.10%
Section width8.07 in (205.0 mm)8.46 in (215.0 mm)+0.39 in (+10.0 mm)+4.88%
Circumference75.62 in (1,920.8 mm)74.68 in (1,896.9 mm)−0.94 in (−23.9 mm)−1.24%
Revolutions per mile838848+11+1.26%
True speed with the speedometer calibrated for 205/50R16
IndicatedActual on 205/50R16Actual on 215/40R17Difference
30 mph30.0 mph29.6 mph−0.4 mph
60 mph60.0 mph59.3 mph−0.7 mph
75 mph75.0 mph74.1 mph−0.9 mph

Ride-height change: 215/40R17 lowers the vehicle by 0.15 in (3.8 mm) at the axle (half the −7.6 mm diameter difference).

215/40R17 is 0.30 in shorter than 205/50R16 and 10 mm wider, a 1.24% difference in overall diameter.

With the speedometer calibrated for 205/50R16, an indicated 60 mph is actually 59.3 mph on 215/40R17, and revolutions per mile change from 838 to 848.

215/40R17 mounts on a 17-inch wheel, a plus-1 fitment from the 16-inch wheel of 205/50R16.

Size pages

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