Tire Size Box

155/80R14 vs 185/60R15

185/60R15 compared with 155/80R14

−0.1% diameter, +1.2" width

185/60R15 is 23.74" tall vs 23.76". Within the 3% rule, so usually interchangeable.

23.8"14" rim4.9"6.1" wide
155/80R14 (solid) compared with 185/60R15 (dashed outline), drawn to scale

With 185/60R15 tires, when your speedometer says 60 mph you are really going

59.9 mph

185/60R15 is −0.02 inches (−0.1%) in overall diameter. That is within the 3% most shops and makers allow.

155/80R14185/60R15Difference%
Overall diameter23.76"23.74"−0.02"−0.1%
Section width6.10"7.28"+1.18"+19.4%
Sidewall height4.88"4.37"−0.51"−10.5%
Circumference74.66"74.58"−0.07"−0.1%
Revolutions per mile848.7849.5+0.8+0.1%

Speedometer difference

If your vehicle came with 155/80R14 and you fit 185/60R15, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.0 mph0.0 mph
30 mph30.0 mph0.0 mph
40 mph40.0 mph0.0 mph
50 mph50.0 mph0.0 mph
60 mph59.9 mph−0.1 mph
65 mph64.9 mph−0.1 mph
70 mph69.9 mph−0.1 mph
75 mph74.9 mph−0.1 mph
80 mph79.9 mph−0.1 mph

Each size on its own

Questions

Which is bigger, 155/80R14 or 185/60R15?
155/80R14 is taller by 0.02 inches (23.76" vs 23.74"). 185/60R15 is wider by 1.18 inches.
Can I replace 155/80R14 with 185/60R15?
Usually, yes. The diameter difference is −0.1%, inside the 3% rule of thumb most tire shops use. Check that the wider or taller tire clears your suspension and fenders, and that its load index meets your placard.
How much will 185/60R15 change my speedometer?
When your speedometer reads 60 mph with 185/60R15 fitted (calibrated for 155/80R14), your real speed is 59.9 mph. Your odometer will over-count miles by about 0.1%.
Will 185/60R15 lift my vehicle?
Ride height changes by half the diameter difference: −0.01 inches of ground clearance at the axle.

Other comparisons