TireSizesFinder

185/65R14 vs 155/80R14

155/80R14 is 0.30 in (7.5 mm) taller than 185/65R14, a +1.26% diameter difference. With the speedometer set for 185/65R14, an indicated 60 mph is 60.8 mph on 155/80R14.

Is this a safe swap?

Diameter difference +1.26%: within the ±3% guideline

By overall diameter alone, 155/80R14 falls inside the ±3% range commonly used as a guideline when replacing 185/65R14. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 185/65R14 (23.47 in) vs 155/80R14 (23.76 in)185/65R1423.47 in × 7.28 in155/80R1423.76 in × 6.10 in
Side profile and tread width, drawn to the same scale.
185/65R14 vs 155/80R14 differences
Measurement185/65R14155/80R14Difference% diff
Overall diameter23.47 in (596.1 mm)23.76 in (603.6 mm)+0.30 in (+7.5 mm)+1.26%
Sidewall height4.73 in (120.3 mm)4.88 in (124.0 mm)+0.15 in (+3.8 mm)+3.12%
Section width7.28 in (185.0 mm)6.10 in (155.0 mm)−1.18 in (−30.0 mm)−16.22%
Circumference73.73 in (1,872.7 mm)74.66 in (1,896.3 mm)+0.93 in (+23.6 mm)+1.26%
Revolutions per mile859849−11−1.24%
True speed with the speedometer calibrated for 185/65R14
IndicatedActual on 185/65R14Actual on 155/80R14Difference
30 mph30.0 mph30.4 mph+0.4 mph
60 mph60.0 mph60.8 mph+0.8 mph
75 mph75.0 mph75.9 mph+0.9 mph

Ride-height change: 155/80R14 raises the vehicle by 0.15 in (3.8 mm) at the axle (half the +7.5 mm diameter difference).

155/80R14 is 0.30 in taller than 185/65R14 and 30 mm narrower, a 1.26% difference in overall diameter.

With the speedometer calibrated for 185/65R14, an indicated 60 mph is actually 60.8 mph on 155/80R14, and revolutions per mile change from 859 to 849.

Both sizes mount on 14-inch wheels.

Size pages

Other comparisons with 185/65R14

Other comparisons with 155/80R14

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