195/65R15 vs 205/55R16

205/55R16 is 0.10 in (2.6 mm) shorter than 195/65R15, a −0.41% diameter difference. With the speedometer set for 195/65R15, an indicated 60 mph is 59.8 mph on 205/55R16.

Is this a safe swap?

Diameter difference −0.41%: under 1%

By overall diameter alone, 205/55R16 is a near match for 195/65R15; 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.

195/65R15 vs 205/55R16 differences
Measurement	195/65R15	205/55R16	Difference	% diff
Overall diameter	24.98 in (634.5 mm)	24.88 in (631.9 mm)	−0.10 in (−2.6 mm)	−0.41%
Sidewall height	4.99 in (126.8 mm)	4.44 in (112.8 mm)	−0.55 in (−14.0 mm)	−11.05%
Section width	7.68 in (195.0 mm)	8.07 in (205.0 mm)	+0.39 in (+10.0 mm)	+5.13%
Circumference	78.48 in (1,993.3 mm)	78.16 in (1,985.2 mm)	−0.32 in (−8.2 mm)	−0.41%
Revolutions per mile	807	811	+3	+0.41%

True speed with the speedometer calibrated for 195/65R15
Indicated	Actual on 195/65R15	Actual on 205/55R16	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: 205/55R16 lowers the vehicle by 0.05 in (1.3 mm) at the axle (half the −2.6 mm diameter difference).

205/55R16 is 0.10 in shorter than 195/65R15 and 10 mm wider, a 0.41% difference in overall diameter.

With the speedometer calibrated for 195/65R15, an indicated 60 mph is actually 59.8 mph on 205/55R16, and revolutions per mile change from 807 to 811.

205/55R16 mounts on a 16-inch wheel, a plus-1 fitment from the 15-inch wheel of 195/65R15.

Size pages

Other comparisons with 195/65R15

Other comparisons with 205/55R16

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