A system to expand and optimize onbike storage\n Mounting Bases are the heart of the BRAD system and are available in three sizes \n Bases can shift a bottle cage away from inconvenient rear shocks, add room for tools or tubes below a bottle cage, or even provide space for a second bottle on sufficientlylong downtubes\n Various BRad accessories are available separately to complete the system\n Total length for reference in frame fit: #2 base 13.2cm; #3 base 20.5cm; #4 base 30.8cm