205/75R15 vs 225/65R16

225/65R16 is 0.41 in (10.4 mm) taller than 205/75R15, a +1.51% diameter difference. With the speedometer set for 205/75R15, an indicated 60 mph is 60.9 mph on 225/65R16.

Is this a safe swap?

Diameter difference +1.51%: within the ±3% guideline

By overall diameter alone, 225/65R16 falls inside the ±3% range commonly used as a guideline when replacing 205/75R15. 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.

205/75R15 vs 225/65R16 differences
Measurement	205/75R15	225/65R16	Difference	% diff
Overall diameter	27.11 in (688.5 mm)	27.52 in (698.9 mm)	+0.41 in (+10.4 mm)	+1.51%
Sidewall height	6.05 in (153.8 mm)	5.76 in (146.3 mm)	−0.30 in (−7.5 mm)	−4.88%
Section width	8.07 in (205.0 mm)	8.86 in (225.0 mm)	+0.79 in (+20.0 mm)	+9.76%
Circumference	85.16 in (2,163.0 mm)	86.44 in (2,195.7 mm)	+1.29 in (+32.7 mm)	+1.51%
Revolutions per mile	744	733	−11	−1.49%

True speed with the speedometer calibrated for 205/75R15
Indicated	Actual on 205/75R15	Actual on 225/65R16	Difference
30 mph	30.0 mph	30.5 mph	+0.5 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: 225/65R16 raises the vehicle by 0.20 in (5.2 mm) at the axle (half the +10.4 mm diameter difference).

225/65R16 is 0.41 in taller than 205/75R15 and 20 mm wider, a 1.51% difference in overall diameter.

With the speedometer calibrated for 205/75R15, an indicated 60 mph is actually 60.9 mph on 225/65R16, and revolutions per mile change from 744 to 733.

225/65R16 mounts on a 16-inch wheel, a plus-1 fitment from the 15-inch wheel of 205/75R15.

Size pages

Other comparisons with 205/75R15

Other comparisons with 225/65R16

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