235/70R15 vs 225/65R17

225/65R17 is 0.56 in (14.3 mm) taller than 235/70R15, a +2.01% diameter difference. With the speedometer set for 235/70R15, an indicated 60 mph is 61.2 mph on 225/65R17.

Is this a safe swap?

Diameter difference +2.01%: within the ±3% guideline

By overall diameter alone, 225/65R17 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.

Side profile and tread width, drawn to the same scale.

235/70R15 vs 225/65R17 differences
Measurement	235/70R15	225/65R17	Difference	% diff
Overall diameter	27.95 in (710.0 mm)	28.52 in (724.3 mm)	+0.56 in (+14.3 mm)	+2.01%
Sidewall height	6.48 in (164.5 mm)	5.76 in (146.3 mm)	−0.72 in (−18.2 mm)	−11.09%
Section width	9.25 in (235.0 mm)	8.86 in (225.0 mm)	−0.39 in (−10.0 mm)	−4.26%
Circumference	87.82 in (2,230.5 mm)	89.58 in (2,275.5 mm)	+1.77 in (+44.9 mm)	+2.01%
Revolutions per mile	722	707	−14	−1.97%

True speed with the speedometer calibrated for 235/70R15
Indicated	Actual on 235/70R15	Actual on 225/65R17	Difference
30 mph	30.0 mph	30.6 mph	+0.6 mph
60 mph	60.0 mph	61.2 mph	+1.2 mph
75 mph	75.0 mph	76.5 mph	+1.5 mph

Ride-height change: 225/65R17 raises the vehicle by 0.28 in (7.1 mm) at the axle (half the +14.3 mm diameter difference).

225/65R17 is 0.56 in taller than 235/70R15 and 10 mm narrower, a 2.01% difference in overall diameter.

With the speedometer calibrated for 235/70R15, an indicated 60 mph is actually 61.2 mph on 225/65R17, and revolutions per mile change from 722 to 707.

225/65R17 mounts on a 17-inch wheel, a plus-2 fitment from the 15-inch wheel of 235/70R15.

Size pages

Other comparisons with 235/70R15

Other comparisons with 225/65R17

Source: Calculated from standard tire geometry formulas. Verified 2026-09-27. How these numbers are calculated.