Have 165 on fixed, and on road bikes have 170 & 172.5 (on my climbing bike)

As Boson Fixed said it is easier to spin at high cadence with shorter cranks--no problem spinning on the fixed (maybe I'm being pulled along) and picking up the cadence when the speed ups, but on my 172.5 bike I usually have the slowest cadence in the group but can stand and torque on hill ciimbs, and ride a big gear.