The Rollo disk enables smoother and more stable crankrolls by providing a wide, predictable surface to stand on. The design is beautifully simple: just slip the axle bolt through the disk and tighten onto the crank.

Improved strength for 2010

Watch Spencer Hochburg in action with the Rollo disks here.
 
Watch Christian Huriwai's review of the Rollo Disks here.
 
Note: Rollo disks are only compatible with KH Moment cranks.  They should be installed after crank installation.  If you are installing both cranks and the Rollo Disk, install the cranks first, then unscrew the bolt and install the Rollo Disk.