165/70R14 vs 195/55R15

195/55R15 is 0.35 in (8.9 mm) taller than 165/70R14, a +1.52% diameter difference. With the speedometer set for 165/70R14, an indicated 60 mph is 60.9 mph on 195/55R15.

Is this a safe swap?

Diameter difference +1.52%: within the ±3% guideline

By overall diameter alone, 195/55R15 falls inside the ±3% range commonly used as a guideline when replacing 165/70R14. 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.

165/70R14 vs 195/55R15 differences
Measurement	165/70R14	195/55R15	Difference	% diff
Overall diameter	23.09 in (586.6 mm)	23.44 in (595.5 mm)	+0.35 in (+8.9 mm)	+1.52%
Sidewall height	4.55 in (115.5 mm)	4.22 in (107.3 mm)	−0.32 in (−8.2 mm)	−7.14%
Section width	6.50 in (165.0 mm)	7.68 in (195.0 mm)	+1.18 in (+30.0 mm)	+18.18%
Circumference	72.55 in (1,842.9 mm)	73.65 in (1,870.8 mm)	+1.10 in (+28.0 mm)	+1.52%
Revolutions per mile	873	860	−13	−1.49%

True speed with the speedometer calibrated for 165/70R14
Indicated	Actual on 165/70R14	Actual on 195/55R15	Difference
30 mph	30.0 mph	30.5 mph	+0.5 mph
60 mph	60.0 mph	60.9 mph	+0.9 mph
75 mph	75.0 mph	76.1 mph	+1.1 mph

Ride-height change: 195/55R15 raises the vehicle by 0.18 in (4.5 mm) at the axle (half the +8.9 mm diameter difference).

195/55R15 is 0.35 in taller than 165/70R14 and 30 mm wider, a 1.52% difference in overall diameter.

With the speedometer calibrated for 165/70R14, an indicated 60 mph is actually 60.9 mph on 195/55R15, and revolutions per mile change from 873 to 860.

195/55R15 mounts on a 15-inch wheel, a plus-1 fitment from the 14-inch wheel of 165/70R14.

Size pages

Other comparisons with 165/70R14

Other comparisons with 195/55R15

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