225/75R14 vs 235/65R16

235/65R16 is 0.74 in (18.8 mm) taller than 225/75R14, a +2.71% diameter difference. With the speedometer set for 225/75R14, an indicated 60 mph is 61.6 mph on 235/65R16.

Is this a safe swap?

Diameter difference +2.71%: within the ±3% guideline

By overall diameter alone, 235/65R16 falls inside the ±3% range commonly used as a guideline when replacing 225/75R14. 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.

225/75R14 vs 235/65R16 differences
Measurement	225/75R14	235/65R16	Difference	% diff
Overall diameter	27.29 in (693.1 mm)	28.03 in (711.9 mm)	+0.74 in (+18.8 mm)	+2.71%
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	85.73 in (2,177.4 mm)	88.05 in (2,236.5 mm)	+2.33 in (+59.1 mm)	+2.71%
Revolutions per mile	739	720	−20	−2.64%

True speed with the speedometer calibrated for 225/75R14
Indicated	Actual on 225/75R14	Actual on 235/65R16	Difference
30 mph	30.0 mph	30.8 mph	+0.8 mph
60 mph	60.0 mph	61.6 mph	+1.6 mph
75 mph	75.0 mph	77.0 mph	+2.0 mph

Ride-height change: 235/65R16 raises the vehicle by 0.37 in (9.4 mm) at the axle (half the +18.8 mm diameter difference).

235/65R16 is 0.74 in taller than 225/75R14 and 10 mm wider, a 2.71% difference in overall diameter.

With the speedometer calibrated for 225/75R14, an indicated 60 mph is actually 61.6 mph on 235/65R16, and revolutions per mile change from 739 to 720.

235/65R16 mounts on a 16-inch wheel, a plus-2 fitment from the 14-inch wheel of 225/75R14.

Size pages

Other comparisons with 225/75R14

Other comparisons with 235/65R16

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