215/70R14 vs 225/55R16

225/55R16 is 0.11 in (2.7 mm) shorter than 215/70R14, a −0.41% diameter difference. With the speedometer set for 215/70R14, an indicated 60 mph is 59.8 mph on 225/55R16.

Is this a safe swap?

Diameter difference −0.41%: under 1%

By overall diameter alone, 225/55R16 is a near match for 215/70R14; 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.

215/70R14 vs 225/55R16 differences
Measurement	215/70R14	225/55R16	Difference	% diff
Overall diameter	25.85 in (656.6 mm)	25.74 in (653.9 mm)	−0.11 in (−2.7 mm)	−0.41%
Sidewall height	5.93 in (150.5 mm)	4.87 in (123.8 mm)	−1.05 in (−26.7 mm)	−17.77%
Section width	8.46 in (215.0 mm)	8.86 in (225.0 mm)	+0.39 in (+10.0 mm)	+4.65%
Circumference	81.21 in (2,062.8 mm)	80.88 in (2,054.3 mm)	−0.33 in (−8.5 mm)	−0.41%
Revolutions per mile	780	783	+3	+0.41%

True speed with the speedometer calibrated for 215/70R14
Indicated	Actual on 215/70R14	Actual on 225/55R16	Difference
30 mph	30.0 mph	29.9 mph	−0.1 mph
60 mph	60.0 mph	59.8 mph	−0.2 mph
75 mph	75.0 mph	74.7 mph	−0.3 mph

Ride-height change: 225/55R16 lowers the vehicle by 0.05 in (1.3 mm) at the axle (half the −2.7 mm diameter difference).

225/55R16 is 0.11 in shorter than 215/70R14 and 10 mm wider, a 0.41% difference in overall diameter.

With the speedometer calibrated for 215/70R14, an indicated 60 mph is actually 59.8 mph on 225/55R16, and revolutions per mile change from 780 to 783.

225/55R16 mounts on a 16-inch wheel, a plus-2 fitment from the 14-inch wheel of 215/70R14.

Size pages

Other comparisons with 215/70R14

Other comparisons with 225/55R16

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