The top features from our outstanding RollerCoaster in a bottom only device.
Two guiding-pulleys, controlled and supported by a spring system.

COMPATIBILITY
To be fixed at the bottom bracket. Fits for most of the latest frames.

CHAINRINGS 
Designed for use with one chainring only, sizes from 42 to 54 T. 

PLEASE NOTE 
Due to the nature of this product there is no warranty