TireSizesFinder

225/40R16 vs 205/40R17

205/40R17 is 0.37 in (9.4 mm) taller than 225/40R16, a +1.60% diameter difference. With the speedometer set for 225/40R16, an indicated 60 mph is 61.0 mph on 205/40R17.

Is this a safe swap?

Diameter difference +1.60%: within the ±3% guideline

By overall diameter alone, 205/40R17 falls inside the ±3% range commonly used as a guideline when replacing 225/40R16. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 225/40R16 (23.09 in) vs 205/40R17 (23.46 in)225/40R1623.09 in × 8.86 in205/40R1723.46 in × 8.07 in
Side profile and tread width, drawn to the same scale.
225/40R16 vs 205/40R17 differences
Measurement225/40R16205/40R17Difference% diff
Overall diameter23.09 in (586.4 mm)23.46 in (595.8 mm)+0.37 in (+9.4 mm)+1.60%
Sidewall height3.54 in (90.0 mm)3.23 in (82.0 mm)−0.31 in (−8.0 mm)−8.89%
Section width8.86 in (225.0 mm)8.07 in (205.0 mm)−0.79 in (−20.0 mm)−8.89%
Circumference72.53 in (1,842.2 mm)73.69 in (1,871.8 mm)+1.16 in (+29.5 mm)+1.60%
Revolutions per mile874860−14−1.58%
True speed with the speedometer calibrated for 225/40R16
IndicatedActual on 225/40R16Actual on 205/40R17Difference
30 mph30.0 mph30.5 mph+0.5 mph
60 mph60.0 mph61.0 mph+1.0 mph
75 mph75.0 mph76.2 mph+1.2 mph

Ride-height change: 205/40R17 raises the vehicle by 0.19 in (4.7 mm) at the axle (half the +9.4 mm diameter difference).

205/40R17 is 0.37 in taller than 225/40R16 and 20 mm narrower, a 1.60% difference in overall diameter.

With the speedometer calibrated for 225/40R16, an indicated 60 mph is actually 61.0 mph on 205/40R17, and revolutions per mile change from 874 to 860.

205/40R17 mounts on a 17-inch wheel, a plus-1 fitment from the 16-inch wheel of 225/40R16.

Size pages

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