TireSizesFinder

265/70R15 vs 235/70R17

235/70R17 is 0.35 in (8.8 mm) taller than 265/70R15, a +1.17% diameter difference. With the speedometer set for 265/70R15, an indicated 60 mph is 60.7 mph on 235/70R17.

Is this a safe swap?

Diameter difference +1.17%: within the ±3% guideline

By overall diameter alone, 235/70R17 falls inside the ±3% range commonly used as a guideline when replacing 265/70R15. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 265/70R15 (29.61 in) vs 235/70R17 (29.95 in)265/70R1529.61 in × 10.43 in235/70R1729.95 in × 9.25 in
Side profile and tread width, drawn to the same scale.
265/70R15 vs 235/70R17 differences
Measurement265/70R15235/70R17Difference% diff
Overall diameter29.61 in (752.0 mm)29.95 in (760.8 mm)+0.35 in (+8.8 mm)+1.17%
Sidewall height7.30 in (185.5 mm)6.48 in (164.5 mm)−0.83 in (−21.0 mm)−11.32%
Section width10.43 in (265.0 mm)9.25 in (235.0 mm)−1.18 in (−30.0 mm)−11.32%
Circumference93.01 in (2,362.5 mm)94.10 in (2,390.1 mm)+1.09 in (+27.6 mm)+1.17%
Revolutions per mile681673−8−1.16%
True speed with the speedometer calibrated for 265/70R15
IndicatedActual on 265/70R15Actual on 235/70R17Difference
30 mph30.0 mph30.4 mph+0.4 mph
60 mph60.0 mph60.7 mph+0.7 mph
75 mph75.0 mph75.9 mph+0.9 mph

Ride-height change: 235/70R17 raises the vehicle by 0.17 in (4.4 mm) at the axle (half the +8.8 mm diameter difference).

235/70R17 is 0.35 in taller than 265/70R15 and 30 mm narrower, a 1.17% difference in overall diameter.

With the speedometer calibrated for 265/70R15, an indicated 60 mph is actually 60.7 mph on 235/70R17, and revolutions per mile change from 681 to 673.

235/70R17 mounts on a 17-inch wheel, a plus-2 fitment from the 15-inch wheel of 265/70R15.

Size pages

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