TireSizesFinder

195/55R16 vs 235/40R17

235/40R17 is 0.04 in (1.1 mm) shorter than 195/55R16, a −0.18% diameter difference. With the speedometer set for 195/55R16, an indicated 60 mph is 59.9 mph on 235/40R17.

Is this a safe swap?

Diameter difference −0.18%: under 1%

By overall diameter alone, 235/40R17 is a near match for 195/55R16; 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: 195/55R16 (24.44 in) vs 235/40R17 (24.40 in)195/55R1624.44 in × 7.68 in235/40R1724.40 in × 9.25 in
Side profile and tread width, drawn to the same scale.
195/55R16 vs 235/40R17 differences
Measurement195/55R16235/40R17Difference% diff
Overall diameter24.44 in (620.9 mm)24.40 in (619.8 mm)−0.04 in (−1.1 mm)−0.18%
Sidewall height4.22 in (107.3 mm)3.70 in (94.0 mm)−0.52 in (−13.2 mm)−12.35%
Section width7.68 in (195.0 mm)9.25 in (235.0 mm)+1.57 in (+40.0 mm)+20.51%
Circumference76.80 in (1,950.6 mm)76.66 in (1,947.2 mm)−0.14 in (−3.5 mm)−0.18%
Revolutions per mile825827+1+0.18%
True speed with the speedometer calibrated for 195/55R16
IndicatedActual on 195/55R16Actual on 235/40R17Difference
30 mph30.0 mph29.9 mph−0.1 mph
60 mph60.0 mph59.9 mph−0.1 mph
75 mph75.0 mph74.9 mph−0.1 mph

Ride-height change: 235/40R17 lowers the vehicle by 0.02 in (0.6 mm) at the axle (half the −1.1 mm diameter difference).

235/40R17 is 0.04 in shorter than 195/55R16 and 40 mm wider, a 0.18% difference in overall diameter.

With the speedometer calibrated for 195/55R16, an indicated 60 mph is actually 59.9 mph on 235/40R17, and revolutions per mile change from 825 to 827.

235/40R17 mounts on a 17-inch wheel, a plus-1 fitment from the 16-inch wheel of 195/55R16.

Size pages

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