TireSizesFinder

265/75R15 vs 225/75R17

225/75R17 is 0.36 in (9.2 mm) shorter than 265/75R15, a −1.18% diameter difference. With the speedometer set for 265/75R15, an indicated 60 mph is 59.3 mph on 225/75R17.

Is this a safe swap?

Diameter difference −1.18%: within the ±3% guideline

By overall diameter alone, 225/75R17 falls inside the ±3% range commonly used as a guideline when replacing 265/75R15. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 265/75R15 (30.65 in) vs 225/75R17 (30.29 in)265/75R1530.65 in × 10.43 in225/75R1730.29 in × 8.86 in
Side profile and tread width, drawn to the same scale.
265/75R15 vs 225/75R17 differences
Measurement265/75R15225/75R17Difference% diff
Overall diameter30.65 in (778.5 mm)30.29 in (769.3 mm)−0.36 in (−9.2 mm)−1.18%
Sidewall height7.82 in (198.8 mm)6.64 in (168.8 mm)−1.18 in (−30.0 mm)−15.09%
Section width10.43 in (265.0 mm)8.86 in (225.0 mm)−1.57 in (−40.0 mm)−15.09%
Circumference96.29 in (2,445.7 mm)95.15 in (2,416.8 mm)−1.14 in (−28.9 mm)−1.18%
Revolutions per mile658666+8+1.20%
True speed with the speedometer calibrated for 265/75R15
IndicatedActual on 265/75R15Actual on 225/75R17Difference
30 mph30.0 mph29.6 mph−0.4 mph
60 mph60.0 mph59.3 mph−0.7 mph
75 mph75.0 mph74.1 mph−0.9 mph

Ride-height change: 225/75R17 lowers the vehicle by 0.18 in (4.6 mm) at the axle (half the −9.2 mm diameter difference).

225/75R17 is 0.36 in shorter than 265/75R15 and 40 mm narrower, a 1.18% difference in overall diameter.

With the speedometer calibrated for 265/75R15, an indicated 60 mph is actually 59.3 mph on 225/75R17, and revolutions per mile change from 658 to 666.

225/75R17 mounts on a 17-inch wheel, a plus-2 fitment from the 15-inch wheel of 265/75R15.

Size pages

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