225/75R16 vs 235/65R17

235/65R17 is 0.26 in (6.6 mm) shorter than 225/75R16, a −0.89% diameter difference. With the speedometer set for 225/75R16, an indicated 60 mph is 59.5 mph on 235/65R17.

Is this a safe swap?

Diameter difference −0.89%: under 1%

By overall diameter alone, 235/65R17 is a near match for 225/75R16; the speedometer changes by less than 1%. 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.

225/75R16 vs 235/65R17 differences
Measurement	225/75R16	235/65R17	Difference	% diff
Overall diameter	29.29 in (743.9 mm)	29.03 in (737.3 mm)	−0.26 in (−6.6 mm)	−0.89%
Sidewall height	6.64 in (168.8 mm)	6.01 in (152.8 mm)	−0.63 in (−16.0 mm)	−9.48%
Section width	8.86 in (225.0 mm)	9.25 in (235.0 mm)	+0.39 in (+10.0 mm)	+4.44%
Circumference	92.01 in (2,337.0 mm)	91.19 in (2,316.3 mm)	−0.82 in (−20.7 mm)	−0.89%
Revolutions per mile	689	695	+6	+0.90%

True speed with the speedometer calibrated for 225/75R16
Indicated	Actual on 225/75R16	Actual on 235/65R17	Difference
30 mph	30.0 mph	29.7 mph	−0.3 mph
60 mph	60.0 mph	59.5 mph	−0.5 mph
75 mph	75.0 mph	74.3 mph	−0.7 mph

Ride-height change: 235/65R17 lowers the vehicle by 0.13 in (3.3 mm) at the axle (half the −6.6 mm diameter difference).

235/65R17 is 0.26 in shorter than 225/75R16 and 10 mm wider, a 0.89% difference in overall diameter.

With the speedometer calibrated for 225/75R16, an indicated 60 mph is actually 59.5 mph on 235/65R17, and revolutions per mile change from 689 to 695.

235/65R17 mounts on a 17-inch wheel, a plus-1 fitment from the 16-inch wheel of 225/75R16.

Size pages

Other comparisons with 225/75R16

Other comparisons with 235/65R17

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