TireSizesFinder

205/65R15 vs 235/45R17

235/45R17 is 0.17 in (4.2 mm) shorter than 205/65R15, a −0.65% diameter difference. With the speedometer set for 205/65R15, an indicated 60 mph is 59.6 mph on 235/45R17.

Is this a safe swap?

Diameter difference −0.65%: under 1%

By overall diameter alone, 235/45R17 is a near match for 205/65R15; 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: 205/65R15 (25.49 in) vs 235/45R17 (25.33 in)205/65R1525.49 in × 8.07 in235/45R1725.33 in × 9.25 in
Side profile and tread width, drawn to the same scale.
205/65R15 vs 235/45R17 differences
Measurement205/65R15235/45R17Difference% diff
Overall diameter25.49 in (647.5 mm)25.33 in (643.3 mm)−0.17 in (−4.2 mm)−0.65%
Sidewall height5.25 in (133.3 mm)4.16 in (105.8 mm)−1.08 in (−27.5 mm)−20.64%
Section width8.07 in (205.0 mm)9.25 in (235.0 mm)+1.18 in (+30.0 mm)+14.63%
Circumference80.09 in (2,034.2 mm)79.57 in (2,021.0 mm)−0.52 in (−13.2 mm)−0.65%
Revolutions per mile791796+5+0.65%
True speed with the speedometer calibrated for 205/65R15
IndicatedActual on 205/65R15Actual on 235/45R17Difference
30 mph30.0 mph29.8 mph−0.2 mph
60 mph60.0 mph59.6 mph−0.4 mph
75 mph75.0 mph74.5 mph−0.5 mph

Ride-height change: 235/45R17 lowers the vehicle by 0.08 in (2.1 mm) at the axle (half the −4.2 mm diameter difference).

235/45R17 is 0.17 in shorter than 205/65R15 and 30 mm wider, a 0.65% difference in overall diameter.

With the speedometer calibrated for 205/65R15, an indicated 60 mph is actually 59.6 mph on 235/45R17, and revolutions per mile change from 791 to 796.

235/45R17 mounts on a 17-inch wheel, a plus-2 fitment from the 15-inch wheel of 205/65R15.

Size pages

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