TireSizesFinder

235/75R15 vs 245/60R17

245/60R17 is 0.30 in (7.7 mm) shorter than 235/75R15, a −1.05% diameter difference. With the speedometer set for 235/75R15, an indicated 60 mph is 59.4 mph on 245/60R17.

Is this a safe swap?

Diameter difference −1.05%: within the ±3% guideline

By overall diameter alone, 245/60R17 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 245/60R17 (28.57 in)235/75R1528.88 in × 9.25 in245/60R1728.57 in × 9.65 in
Side profile and tread width, drawn to the same scale.
235/75R15 vs 245/60R17 differences
Measurement235/75R15245/60R17Difference% diff
Overall diameter28.88 in (733.5 mm)28.57 in (725.8 mm)−0.30 in (−7.7 mm)−1.05%
Sidewall height6.94 in (176.3 mm)5.79 in (147.0 mm)−1.15 in (−29.2 mm)−16.60%
Section width9.25 in (235.0 mm)9.65 in (245.0 mm)+0.39 in (+10.0 mm)+4.26%
Circumference90.72 in (2,304.4 mm)89.77 in (2,280.2 mm)−0.95 in (−24.2 mm)−1.05%
Revolutions per mile698706+7+1.06%
True speed with the speedometer calibrated for 235/75R15
IndicatedActual on 235/75R15Actual on 245/60R17Difference
30 mph30.0 mph29.7 mph−0.3 mph
60 mph60.0 mph59.4 mph−0.6 mph
75 mph75.0 mph74.2 mph−0.8 mph

Ride-height change: 245/60R17 lowers the vehicle by 0.15 in (3.9 mm) at the axle (half the −7.7 mm diameter difference).

245/60R17 is 0.30 in shorter than 235/75R15 and 10 mm wider, a 1.05% difference in overall diameter.

With the speedometer calibrated for 235/75R15, an indicated 60 mph is actually 59.4 mph on 245/60R17, and revolutions per mile change from 698 to 706.

245/60R17 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.