US Bases

US Cup (US) Mast Bases (Base) are compatible with US mast extensions. The Mast Base is the connection between your rig and your board. We sell bases from Chinook, Streamlines, Aeron and Bic. The base has a flexing universal joint (UJ) in the middle to allow 90 degree flex and 360 degree rotation. US cup are available in; three UJ types: Rubber, Mechanical or Tendon; three board connection types: One-Bolt, Two-Bolt or RSX mast track pin. Tendon UJ deliver most direct performance, Mechanical provides direct and easiest connection, while Rubber UJ provides more shock absorbing qualities.
  • Chinook 1-Bolt Rubber- US

    One of the fastest to install, adjust & remove. This design is very low to the deck and easy to adjust.
    $81.00
  • Chinook 1-Bolt Mechanical- US

    One of the fastest to install, adjust & remove. Mechanical joint makes for quick separation of rig.
    $81.00
  • Chinook 1-Bolt Tendon- US

    One of the fastest to install, remove & take off the board. This design is very low to the deck and efficient energy transfer - used by the pro's.
    $86.00
  • Chinook 2-Bolt Mechanical- US

    A proven mechanical 2-bolt design incorporating a built-in wrench and safety-lock mechanism and easy attachment in the water.
    $90.00
  • Chinook 2-Bolt Tendon- US

    New 2 bolt tendon base with Cast Stainless Steal Caps, and Cap Spindle lower with built in hex wrench and removable lower deck plate.
    $98.00
  • Chinook 2-Bolt Upper w/Mechanical- US

    Chinook Upper part only for Two-Bolt "Quick Release" Mechanical Mast Base. Does Not include Q/R deck plate.
    $67.00
  • Chinook 2-Bolt Upper w/Tendon- US

    New 2 bolt tendon Upper base with Cast Stainless Steal Caps, and Cap Spindle lower with built in hex wrench.
    $75.00