195/50R16 vs 195/55R16

195/55R16 is 0.77 in (19.5 mm) taller than 195/50R16, a +3.24% diameter difference. With the speedometer set for 195/50R16, an indicated 60 mph is 61.9 mph on 195/55R16.

Is this a safe swap?

Diameter difference +3.24%: outside the ±3% guideline

By overall diameter alone, 195/55R16 falls outside the ±3% range commonly used as a guideline when replacing 195/50R16; speedometer and ride-height changes are larger. 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.

195/50R16 vs 195/55R16 differences
Measurement	195/50R16	195/55R16	Difference	% diff
Overall diameter	23.68 in (601.4 mm)	24.44 in (620.9 mm)	+0.77 in (+19.5 mm)	+3.24%
Sidewall height	3.84 in (97.5 mm)	4.22 in (107.3 mm)	+0.38 in (+9.8 mm)	+10.00%
Section width	7.68 in (195.0 mm)	7.68 in (195.0 mm)	0.00 in (0.0 mm)	0.00%
Circumference	74.38 in (1,889.4 mm)	76.80 in (1,950.6 mm)	+2.41 in (+61.3 mm)	+3.24%
Revolutions per mile	852	825	−27	−3.14%

True speed with the speedometer calibrated for 195/50R16
Indicated	Actual on 195/50R16	Actual on 195/55R16	Difference
30 mph	30.0 mph	31.0 mph	+1.0 mph
60 mph	60.0 mph	61.9 mph	+1.9 mph
75 mph	75.0 mph	77.4 mph	+2.4 mph

Ride-height change: 195/55R16 raises the vehicle by 0.38 in (9.8 mm) at the axle (half the +19.5 mm diameter difference).

195/55R16 is 0.77 in taller than 195/50R16 and the same width, a 3.24% difference in overall diameter.

With the speedometer calibrated for 195/50R16, an indicated 60 mph is actually 61.9 mph on 195/55R16, and revolutions per mile change from 852 to 825.

Both sizes mount on 16-inch wheels.

Size pages

Other comparisons with 195/50R16

Other comparisons with 195/55R16

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