TireSizesFinder

235/70R15 vs 225/60R17

225/60R17 is 0.32 in (8.2 mm) shorter than 235/70R15, a −1.15% diameter difference. With the speedometer set for 235/70R15, an indicated 60 mph is 59.3 mph on 225/60R17.

Is this a safe swap?

Diameter difference −1.15%: within the ±3% guideline

By overall diameter alone, 225/60R17 falls inside the ±3% range commonly used as a guideline when replacing 235/70R15. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 235/70R15 (27.95 in) vs 225/60R17 (27.63 in)235/70R1527.95 in × 9.25 in225/60R1727.63 in × 8.86 in
Side profile and tread width, drawn to the same scale.
235/70R15 vs 225/60R17 differences
Measurement235/70R15225/60R17Difference% diff
Overall diameter27.95 in (710.0 mm)27.63 in (701.8 mm)−0.32 in (−8.2 mm)−1.15%
Sidewall height6.48 in (164.5 mm)5.31 in (135.0 mm)−1.16 in (−29.5 mm)−17.93%
Section width9.25 in (235.0 mm)8.86 in (225.0 mm)−0.39 in (−10.0 mm)−4.26%
Circumference87.82 in (2,230.5 mm)86.80 in (2,204.8 mm)−1.01 in (−25.8 mm)−1.15%
Revolutions per mile722730+8+1.17%
True speed with the speedometer calibrated for 235/70R15
IndicatedActual on 235/70R15Actual on 225/60R17Difference
30 mph30.0 mph29.7 mph−0.3 mph
60 mph60.0 mph59.3 mph−0.7 mph
75 mph75.0 mph74.1 mph−0.9 mph

Ride-height change: 225/60R17 lowers the vehicle by 0.16 in (4.1 mm) at the axle (half the −8.2 mm diameter difference).

225/60R17 is 0.32 in shorter than 235/70R15 and 10 mm narrower, a 1.15% difference in overall diameter.

With the speedometer calibrated for 235/70R15, an indicated 60 mph is actually 59.3 mph on 225/60R17, and revolutions per mile change from 722 to 730.

225/60R17 mounts on a 17-inch wheel, a plus-2 fitment from the 15-inch wheel of 235/70R15.

Size pages

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