215/75R15 vs 225/65R16

225/65R16 is 0.18 in (4.6 mm) shorter than 215/75R15, a −0.65% diameter difference. With the speedometer set for 215/75R15, an indicated 60 mph is 59.6 mph on 225/65R16.

Is this a safe swap?

Diameter difference −0.65%: under 1%

By overall diameter alone, 225/65R16 is a near match for 215/75R15; 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.

215/75R15 vs 225/65R16 differences
Measurement	215/75R15	225/65R16	Difference	% diff
Overall diameter	27.70 in (703.5 mm)	27.52 in (698.9 mm)	−0.18 in (−4.6 mm)	−0.65%
Sidewall height	6.35 in (161.3 mm)	5.76 in (146.3 mm)	−0.59 in (−15.0 mm)	−9.30%
Section width	8.46 in (215.0 mm)	8.86 in (225.0 mm)	+0.39 in (+10.0 mm)	+4.65%
Circumference	87.01 in (2,210.1 mm)	86.44 in (2,195.7 mm)	−0.57 in (−14.5 mm)	−0.65%
Revolutions per mile	728	733	+5	+0.66%

True speed with the speedometer calibrated for 215/75R15
Indicated	Actual on 215/75R15	Actual on 225/65R16	Difference
30 mph	30.0 mph	29.8 mph	−0.2 mph
60 mph	60.0 mph	59.6 mph	−0.4 mph
75 mph	75.0 mph	74.5 mph	−0.5 mph

Ride-height change: 225/65R16 lowers the vehicle by 0.09 in (2.3 mm) at the axle (half the −4.6 mm diameter difference).

225/65R16 is 0.18 in shorter than 215/75R15 and 10 mm wider, a 0.65% difference in overall diameter.

With the speedometer calibrated for 215/75R15, an indicated 60 mph is actually 59.6 mph on 225/65R16, and revolutions per mile change from 728 to 733.

225/65R16 mounts on a 16-inch wheel, a plus-1 fitment from the 15-inch wheel of 215/75R15.

Size pages

Other comparisons with 215/75R15

Other comparisons with 225/65R16

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