TireSizesFinder

225/65R15 vs 235/50R17

235/50R17 is 0.26 in (6.7 mm) shorter than 225/65R15, a −0.99% diameter difference. With the speedometer set for 225/65R15, an indicated 60 mph is 59.4 mph on 235/50R17.

Is this a safe swap?

Diameter difference −0.99%: under 1%

By overall diameter alone, 235/50R17 is a near match for 225/65R15; 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: 225/65R15 (26.52 in) vs 235/50R17 (26.25 in)225/65R1526.52 in × 8.86 in235/50R1726.25 in × 9.25 in
Side profile and tread width, drawn to the same scale.
225/65R15 vs 235/50R17 differences
Measurement225/65R15235/50R17Difference% diff
Overall diameter26.52 in (673.5 mm)26.25 in (666.8 mm)−0.26 in (−6.7 mm)−0.99%
Sidewall height5.76 in (146.3 mm)4.63 in (117.5 mm)−1.13 in (−28.7 mm)−19.66%
Section width8.86 in (225.0 mm)9.25 in (235.0 mm)+0.39 in (+10.0 mm)+4.44%
Circumference83.30 in (2,115.9 mm)82.47 in (2,094.8 mm)−0.83 in (−21.0 mm)−0.99%
Revolutions per mile761768+8+1.00%
True speed with the speedometer calibrated for 225/65R15
IndicatedActual on 225/65R15Actual on 235/50R17Difference
30 mph30.0 mph29.7 mph−0.3 mph
60 mph60.0 mph59.4 mph−0.6 mph
75 mph75.0 mph74.3 mph−0.7 mph

Ride-height change: 235/50R17 lowers the vehicle by 0.13 in (3.4 mm) at the axle (half the −6.7 mm diameter difference).

235/50R17 is 0.26 in shorter than 225/65R15 and 10 mm wider, a 0.99% difference in overall diameter.

With the speedometer calibrated for 225/65R15, an indicated 60 mph is actually 59.4 mph on 235/50R17, and revolutions per mile change from 761 to 768.

235/50R17 mounts on a 17-inch wheel, a plus-2 fitment from the 15-inch wheel of 225/65R15.

Size pages

Other comparisons with 225/65R15

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