The ACID Carrier SIC Rail Boost is Cube's slimline, minimalist take on stylish practicality. It's an easy way to attach panniers for extra load-carrying capacity. It's retrofit-compatible with the ACID Top Rail RILink to add even more cargo volume plus the RILink interface. This luggage carrier is compatible with CUBE bikes with 27.5" or 29" wheels, Boost standard, and the SIC frame interface.