235/70R17 vs 225/75R17

225/75R17 is 0.33 in (8.5 mm) taller than 235/70R17, a +1.12% diameter difference. With the speedometer set for 235/70R17, an indicated 60 mph is 60.7 mph on 225/75R17.

Is this a safe swap?

Diameter difference +1.12%: within the ±3% guideline

By overall diameter alone, 225/75R17 falls inside the ±3% range commonly used as a guideline when replacing 235/70R17. 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.

235/70R17 vs 225/75R17 differences
Measurement	235/70R17	225/75R17	Difference	% diff
Overall diameter	29.95 in (760.8 mm)	30.29 in (769.3 mm)	+0.33 in (+8.5 mm)	+1.12%
Sidewall height	6.48 in (164.5 mm)	6.64 in (168.8 mm)	+0.17 in (+4.3 mm)	+2.58%
Section width	9.25 in (235.0 mm)	8.86 in (225.0 mm)	−0.39 in (−10.0 mm)	−4.26%
Circumference	94.10 in (2,390.1 mm)	95.15 in (2,416.8 mm)	+1.05 in (+26.7 mm)	+1.12%
Revolutions per mile	673	666	−7	−1.10%

True speed with the speedometer calibrated for 235/70R17
Indicated	Actual on 235/70R17	Actual on 225/75R17	Difference
30 mph	30.0 mph	30.3 mph	+0.3 mph
60 mph	60.0 mph	60.7 mph	+0.7 mph
75 mph	75.0 mph	75.8 mph	+0.8 mph

Ride-height change: 225/75R17 raises the vehicle by 0.17 in (4.3 mm) at the axle (half the +8.5 mm diameter difference).

225/75R17 is 0.33 in taller than 235/70R17 and 10 mm narrower, a 1.12% difference in overall diameter.

With the speedometer calibrated for 235/70R17, an indicated 60 mph is actually 60.7 mph on 225/75R17, and revolutions per mile change from 673 to 666.

Both sizes mount on 17-inch wheels.

Size pages

Other comparisons with 235/70R17

Other comparisons with 225/75R17

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