TireSizesFinder

155/80R14 vs 205/55R15

205/55R15 is 0.11 in (2.9 mm) taller than 155/80R14, a +0.48% diameter difference. With the speedometer set for 155/80R14, an indicated 60 mph is 60.3 mph on 205/55R15.

Is this a safe swap?

Diameter difference +0.48%: under 1%

By overall diameter alone, 205/55R15 is a near match for 155/80R14; the speedometer changes by less than 1%. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 155/80R14 (23.76 in) vs 205/55R15 (23.88 in)155/80R1423.76 in × 6.10 in205/55R1523.88 in × 8.07 in
Side profile and tread width, drawn to the same scale.
155/80R14 vs 205/55R15 differences
Measurement155/80R14205/55R15Difference% diff
Overall diameter23.76 in (603.6 mm)23.88 in (606.5 mm)+0.11 in (+2.9 mm)+0.48%
Sidewall height4.88 in (124.0 mm)4.44 in (112.8 mm)−0.44 in (−11.2 mm)−9.07%
Section width6.10 in (155.0 mm)8.07 in (205.0 mm)+1.97 in (+50.0 mm)+32.26%
Circumference74.66 in (1,896.3 mm)75.01 in (1,905.4 mm)+0.36 in (+9.1 mm)+0.48%
Revolutions per mile849845−4−0.48%
True speed with the speedometer calibrated for 155/80R14
IndicatedActual on 155/80R14Actual on 205/55R15Difference
30 mph30.0 mph30.1 mph+0.1 mph
60 mph60.0 mph60.3 mph+0.3 mph
75 mph75.0 mph75.4 mph+0.4 mph

Ride-height change: 205/55R15 raises the vehicle by 0.06 in (1.5 mm) at the axle (half the +2.9 mm diameter difference).

205/55R15 is 0.11 in taller than 155/80R14 and 50 mm wider, a 0.48% difference in overall diameter.

With the speedometer calibrated for 155/80R14, an indicated 60 mph is actually 60.3 mph on 205/55R15, and revolutions per mile change from 849 to 845.

205/55R15 mounts on a 15-inch wheel, a plus-1 fitment from the 14-inch wheel of 155/80R14.

Size pages

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Source: Calculated from standard tire geometry formulas. Verified . How these numbers are calculated.