US Base Cup

Fits most standard mast tracks and bases. 

Tendon joint provides excellent performance and is easy to replace. This unique design is very low to the deck with four finger ribs for easy adjustment.

Rubber joint provides shock absorption in choppy conditions. This unique design is very low to the deck with four finger ribs for easy adjustment.   1-Bolt Rubber Mast Base US Cup 1-Bolt Twist-On Mast Base Universal Complete US Base Cup Rubber...

Mechanical joint is easy to attach to wide boards and provides instant drive to race boards. This unique design is very low to the deck with four finger ribs for easy adjustment.

Epic Gear Euro Pin to US Cup Adapter Kit An Epic Gear Euro Pin to US Cup Adapter Kit to make a Euro Pin mast base fit a US Cup Mast Extension.  Made to attach to the base with an stainless steel C-clip. Comes with 2 button spring clip.

The sleek Six Pin adjusting collar and anodized logo/index markings are some of the unique and innovative features that make these the most popular extensions on the market. Standard with the proven US Power-Haul pulley and cleat system and 2 cm...

The new Six Pin adjusting collar and anodized logo/index markings are some of the unique and innovative features that make these the most popular extensions on the market. Standard with the proven US Power-Haul pulley and cleat system and 2 cm adjustment...

Upper part only for Two-Bolt "Quick Release" Tendon Mast Base.

Tendon joint provides excellent performance and is easy to replace. This proven design incorporates a built-in wrench for baseplate adjustment and a safety-lock mechanism. Indisputably the most dependable and easiest to use base available.

Upper part only for Two-Bolt "Quick Release" Mechanical Mast Base.

Custom alloy and bell shaped tubing provide the best weight to strength available in aluminum. New easy to use Composite Snap Collar system eliminates lost pins or collars and can be quickly adjusted with one hand. All come with the proven US Power-Haul...

Elegant and very strong. New easy to use Composite Snap Collar system eliminates lost pins or collars and can be quickly adjusted with one hand. All come with the proven US Power-Haul pulley and cleat system and 2 cm adjustment increments. Adds a maximum...

Upper part only for Two-Bolt "Quick Release" Rubber Mast Base.

The sleek Six Pin adjusting collar and anodized logo/index markings are some of the unique and innovative features that make these the most popular extensions on the market. Standard with the proven US Power-Haul pulley and cleat system and 2 cm...

Quick release plate for all Two-Bolt "Quick Release" Mast Bases. Includes mounting hardware.

Product Details The all new Chinook Sailing 1-Bolt Pro Flex Mast Base US Base Cup features all of the advantages of a tendon base with the added features of a mechanical base.    Same shock absorption as standard Tendon bases for...

Custom alloy and bell shaped tubing provide the best weight to strength available in aluminum. New easy to use Composite Snap Collar system eliminates lost pins or collars and can be quickly adjusted with one hand. All come with the proven US Power-Haul...

Elegant and very strong. New easy to use Composite Snap Collar system eliminates lost pins or collars and can be quickly adjusted with one hand. All come with the proven US Power-Haul pulley and cleat system and 2 cm adjustment increments. Adds a maximum...

Mechanical joint is easy to attach to wide boards and provides instant drive to race boards. This proven design incorporates a built-in wrench for baseplate adjustment and a safety-lock mechanism. Indisputably the most dependable and easiest to use base...

Improved lay-up and manufacturing process! Our lightest extensions come with a Six Pin adjusting collar and are stronger than ever with reinforced sidewalls. All come with the proven US Power-Haul pulley and cleat system and cm index markings. 2 cm...