215/55R16 vs 225/55R16

225/55R16 is 0.43 in (11.0 mm) taller than 215/55R16, a +1.71% diameter difference. With the speedometer set for 215/55R16, an indicated 60 mph is 61.0 mph on 225/55R16.

Is this a safe swap?

Diameter difference +1.71%: within the ±3% guideline

By overall diameter alone, 225/55R16 falls inside the ±3% range commonly used as a guideline when replacing 215/55R16. 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.

215/55R16 vs 225/55R16 differences
Measurement	215/55R16	225/55R16	Difference	% diff
Overall diameter	25.31 in (642.9 mm)	25.74 in (653.9 mm)	+0.43 in (+11.0 mm)	+1.71%
Sidewall height	4.66 in (118.3 mm)	4.87 in (123.8 mm)	+0.22 in (+5.5 mm)	+4.65%
Section width	8.46 in (215.0 mm)	8.86 in (225.0 mm)	+0.39 in (+10.0 mm)	+4.65%
Circumference	79.52 in (2,019.7 mm)	80.88 in (2,054.3 mm)	+1.36 in (+34.6 mm)	+1.71%
Revolutions per mile	797	783	−13	−1.68%

True speed with the speedometer calibrated for 215/55R16
Indicated	Actual on 215/55R16	Actual on 225/55R16	Difference
30 mph	30.0 mph	30.5 mph	+0.5 mph
60 mph	60.0 mph	61.0 mph	+1.0 mph
75 mph	75.0 mph	76.3 mph	+1.3 mph

Ride-height change: 225/55R16 raises the vehicle by 0.22 in (5.5 mm) at the axle (half the +11.0 mm diameter difference).

225/55R16 is 0.43 in taller than 215/55R16 and 10 mm wider, a 1.71% difference in overall diameter.

With the speedometer calibrated for 215/55R16, an indicated 60 mph is actually 61.0 mph on 225/55R16, and revolutions per mile change from 797 to 783.

Both sizes mount on 16-inch wheels.

Size pages

Other comparisons with 215/55R16

Other comparisons with 225/55R16

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