TireSizesFinder

235/75R15 vs 225/65R17

225/65R17 is 0.36 in (9.2 mm) shorter than 235/75R15, a −1.25% diameter difference. With the speedometer set for 235/75R15, an indicated 60 mph is 59.2 mph on 225/65R17.

Is this a safe swap?

Diameter difference −1.25%: within the ±3% guideline

By overall diameter alone, 225/65R17 falls inside the ±3% range commonly used as a guideline when replacing 235/75R15. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 235/75R15 (28.88 in) vs 225/65R17 (28.52 in)235/75R1528.88 in × 9.25 in225/65R1728.52 in × 8.86 in
Side profile and tread width, drawn to the same scale.
235/75R15 vs 225/65R17 differences
Measurement235/75R15225/65R17Difference% diff
Overall diameter28.88 in (733.5 mm)28.52 in (724.3 mm)−0.36 in (−9.2 mm)−1.25%
Sidewall height6.94 in (176.3 mm)5.76 in (146.3 mm)−1.18 in (−30.0 mm)−17.02%
Section width9.25 in (235.0 mm)8.86 in (225.0 mm)−0.39 in (−10.0 mm)−4.26%
Circumference90.72 in (2,304.4 mm)89.58 in (2,275.5 mm)−1.14 in (−28.9 mm)−1.25%
Revolutions per mile698707+9+1.27%
True speed with the speedometer calibrated for 235/75R15
IndicatedActual on 235/75R15Actual on 225/65R17Difference
30 mph30.0 mph29.6 mph−0.4 mph
60 mph60.0 mph59.2 mph−0.8 mph
75 mph75.0 mph74.1 mph−0.9 mph

Ride-height change: 225/65R17 lowers the vehicle by 0.18 in (4.6 mm) at the axle (half the −9.2 mm diameter difference).

225/65R17 is 0.36 in shorter than 235/75R15 and 10 mm narrower, a 1.25% difference in overall diameter.

With the speedometer calibrated for 235/75R15, an indicated 60 mph is actually 59.2 mph on 225/65R17, and revolutions per mile change from 698 to 707.

225/65R17 mounts on a 17-inch wheel, a plus-2 fitment from the 15-inch wheel of 235/75R15.

Size pages

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