225/75R17 vs 235/75R17

235/75R17 is 0.59 in (15.0 mm) taller than 225/75R17, a +1.95% diameter difference. With the speedometer set for 225/75R17, an indicated 60 mph is 61.2 mph on 235/75R17.

Is this a safe swap?

Diameter difference +1.95%: within the ±3% guideline

By overall diameter alone, 235/75R17 falls inside the ±3% range commonly used as a guideline when replacing 225/75R17. 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.

225/75R17 vs 235/75R17 differences
Measurement	225/75R17	235/75R17	Difference	% diff
Overall diameter	30.29 in (769.3 mm)	30.88 in (784.3 mm)	+0.59 in (+15.0 mm)	+1.95%
Sidewall height	6.64 in (168.8 mm)	6.94 in (176.3 mm)	+0.30 in (+7.5 mm)	+4.44%
Section width	8.86 in (225.0 mm)	9.25 in (235.0 mm)	+0.39 in (+10.0 mm)	+4.44%
Circumference	95.15 in (2,416.8 mm)	97.01 in (2,464.0 mm)	+1.86 in (+47.1 mm)	+1.95%
Revolutions per mile	666	653	−13	−1.91%

True speed with the speedometer calibrated for 225/75R17
Indicated	Actual on 225/75R17	Actual on 235/75R17	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: 235/75R17 raises the vehicle by 0.30 in (7.5 mm) at the axle (half the +15.0 mm diameter difference).

235/75R17 is 0.59 in taller than 225/75R17 and 10 mm wider, a 1.95% difference in overall diameter.

With the speedometer calibrated for 225/75R17, an indicated 60 mph is actually 61.2 mph on 235/75R17, and revolutions per mile change from 666 to 653.

Both sizes mount on 17-inch wheels.

Size pages

Other comparisons with 225/75R17

Other comparisons with 235/75R17

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