The Chinook US Cup Bases are made specifically for use with Chinook's US Cup extensions. The simple design is legendary for its robust nature and minimal yet easy maintenance. Windsurfers have the choice of the 1-Bolt or 2-Bolt design as well as the choice or Rubber, Tendon, or Mechanical universal joints.
The 1-Bolt design is a very simple plug and play option. The 2-Bolt system offers a different option for connecting and disconnecting the rig from the board.
The various joint options are often a matter of personal preference. The Mechanical are however primarily used by schools and camps.