205/70R14 vs 205/55R16

205/55R16 is 0.42 in (10.7 mm) shorter than 205/70R14, a −1.67% diameter difference. With the speedometer set for 205/70R14, an indicated 60 mph is 59.0 mph on 205/55R16.

Is this a safe swap?

Diameter difference −1.67%: within the ±3% guideline

By overall diameter alone, 205/55R16 falls inside the ±3% range commonly used as a guideline when replacing 205/70R14. 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.

205/70R14 vs 205/55R16 differences
Measurement	205/70R14	205/55R16	Difference	% diff
Overall diameter	25.30 in (642.6 mm)	24.88 in (631.9 mm)	−0.42 in (−10.7 mm)	−1.67%
Sidewall height	5.65 in (143.5 mm)	4.44 in (112.8 mm)	−1.21 in (−30.7 mm)	−21.43%
Section width	8.07 in (205.0 mm)	8.07 in (205.0 mm)	0.00 in (0.0 mm)	0.00%
Circumference	79.48 in (2,018.8 mm)	78.16 in (1,985.2 mm)	−1.32 in (−33.6 mm)	−1.67%
Revolutions per mile	797	811	+13	+1.69%

True speed with the speedometer calibrated for 205/70R14
Indicated	Actual on 205/70R14	Actual on 205/55R16	Difference
30 mph	30.0 mph	29.5 mph	−0.5 mph
60 mph	60.0 mph	59.0 mph	−1.0 mph
75 mph	75.0 mph	73.8 mph	−1.2 mph

Ride-height change: 205/55R16 lowers the vehicle by 0.21 in (5.3 mm) at the axle (half the −10.7 mm diameter difference).

205/55R16 is 0.42 in shorter than 205/70R14 and the same width, a 1.67% difference in overall diameter.

With the speedometer calibrated for 205/70R14, an indicated 60 mph is actually 59.0 mph on 205/55R16, and revolutions per mile change from 797 to 811.

205/55R16 mounts on a 16-inch wheel, a plus-2 fitment from the 14-inch wheel of 205/70R14.

Size pages

Other comparisons with 205/70R14

Other comparisons with 205/55R16

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