235/75R15 vs 225/75R16

225/75R16 is 0.41 in (10.4 mm) taller than 235/75R15, a +1.42% diameter difference. With the speedometer set for 235/75R15, an indicated 60 mph is 60.9 mph on 225/75R16.

Is this a safe swap?

Diameter difference +1.42%: within the ±3% guideline

By overall diameter alone, 225/75R16 falls inside the ±3% range commonly used as a guideline when replacing 235/75R15. 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.

235/75R15 vs 225/75R16 differences
Measurement	235/75R15	225/75R16	Difference	% diff
Overall diameter	28.88 in (733.5 mm)	29.29 in (743.9 mm)	+0.41 in (+10.4 mm)	+1.42%
Sidewall height	6.94 in (176.3 mm)	6.64 in (168.8 mm)	−0.30 in (−7.5 mm)	−4.26%
Section width	9.25 in (235.0 mm)	8.86 in (225.0 mm)	−0.39 in (−10.0 mm)	−4.26%
Circumference	90.72 in (2,304.4 mm)	92.01 in (2,337.0 mm)	+1.29 in (+32.7 mm)	+1.42%
Revolutions per mile	698	689	−10	−1.40%

True speed with the speedometer calibrated for 235/75R15
Indicated	Actual on 235/75R15	Actual on 225/75R16	Difference
30 mph	30.0 mph	30.4 mph	+0.4 mph
60 mph	60.0 mph	60.9 mph	+0.9 mph
75 mph	75.0 mph	76.1 mph	+1.1 mph

Ride-height change: 225/75R16 raises the vehicle by 0.20 in (5.2 mm) at the axle (half the +10.4 mm diameter difference).

225/75R16 is 0.41 in taller than 235/75R15 and 10 mm narrower, a 1.42% difference in overall diameter.

With the speedometer calibrated for 235/75R15, an indicated 60 mph is actually 60.9 mph on 225/75R16, and revolutions per mile change from 698 to 689.

225/75R16 mounts on a 16-inch wheel, a plus-1 fitment from the 15-inch wheel of 235/75R15.

Size pages

Other comparisons with 235/75R15

Other comparisons with 225/75R16

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