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Windsurf UJs & Mast Extensions

Adjusting your downhaul on your windsurfer or getting the foot close to the deck. You need a good mast extension to get the correct height for your sail. Maybe a rachet Duotone mast extension is a good plan to make life easy.
  • Prolimit Mast extension Windsurfing SDM 30cm

    Original price £49.95 - Original price £49.95
    Original price
    £49.95
    £49.95 - £49.95
    Current price £49.95

    Prolimit Windsurfing Adjustable Mast Extension Hinge coller with pins for easy and secure adjustment, Collar on the top of the extension so you ca...

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    Original price £49.95 - Original price £49.95
    Original price
    £49.95
    £49.95 - £49.95
    Current price £49.95
  • Prolimit RDM Mast Foot Adapter Windsurfing

    Original price £25.00 - Original price £25.00
    Original price
    £25.00
    £25.00 - £25.00
    Current price £25.00

    RDM Mast foot adapter with europin hole in the base, 3 rollers, so a 6:1 down haul pulley system can be used

    Original price £25.00 - Original price £25.00
    Original price
    £25.00
    £25.00 - £25.00
    Current price £25.00
  • Prolimit Windsurfing Adjustable Mast Extension RDM

    Original price £49.95 - Original price £54.00
    Original price
    £49.95 - £54.00
    £49.95 - £54.00
    Current price £49.95

    Prolimit Windsurfing Adjustable Mast Extension Hinge coller with pins for easy and secure adjustment, Collar on the top of the extension so you ca...

    View full details
    Original price £49.95 - Original price £54.00
    Original price
    £49.95 - £54.00
    £49.95 - £54.00
    Current price £49.95
  • Radz Knuckle UJ Windsurf / Windsup

    Original price £42.00 - Original price £42.00
    Original price
    £42.00
    £42.00 - £42.00
    Current price £42.00

    Radz Knuckle uj perfect for windsup's and stand windsurfing boards. A must for every windsurfer the UJ – make sure you change them regularly (coup...

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    Original price £42.00 - Original price £42.00
    Original price
    £42.00
    £42.00 - £42.00
    Current price £42.00
    Sold out
  • Radz SDM Mast foot Windsurfing

    Original price £17.99 - Original price £17.99
    Original price
    £17.99
    £17.99 - £17.99
    Current price £17.99

    Radz SDM Mast foot Prolimit 0cm SDM (standard diameter Masts) Mast Base is designed to to fit straight into the bottom of the mast or onto a drop o...

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    Original price £17.99 - Original price £17.99
    Original price
    £17.99
    £17.99 - £17.99
    Current price £17.99
    Sold out
  • Radz Standard Rubber UJ Base Plate

    Original price £42.00 - Original price £42.00
    Original price
    £42.00
    £42.00 - £42.00
    Current price £42.00

    Radz classic UJ and base plate in one, with euro pin on top and brass nut track fitting on the base

    Original price £42.00 - Original price £42.00
    Original price
    £42.00
    £42.00 - £42.00
    Current price £42.00
  • Radz Tendon Starbase UJ

    Original price £39.99 - Original price £39.99
    Original price
    £39.99
    £39.99 - £39.99
    Current price £39.99

    The Radz tendon starbase uj comes with short north euro pin Tendon rubber creating better transfer of power through board than a boge joint, best ...

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    Original price £39.99 - Original price £39.99
    Original price
    £39.99
    £39.99 - £39.99
    Current price £39.99

We sell many different windsurfing mast extensions. There are two types of windsurfing extensions, SDM Standard Diameter Mast extensions and RDM Reduced Diameter mast extensions. Shortly MDM with be arriving in stock here at Boardworx in the United Kingdom. This new size was developed by North windsurfing and is a size between these sizes.

The SDM windsurfing mast extension is designed for a fatter mast size of 48.8mm and is what most older windsurfing sails are made for, and also sails larger than 6.5m. RDM was developed for smaller windsurfing sails, and the internal diameter of these masts is 32-33mm. The new MDM has been designed for the windsurfer who wants the light weight of an RDM but wants the power given by an SDM mast.

Most Windsurfing mast extensions are adjustable in length so you can use them on different size sails. You can have fixed-length mast extensions, but these are rare. The sailboard mast extension is essential so you can rig the sail correctly. 

The Windsurf extension is made of Carbon or aluminium, and carbon extensions are great to use as they are so light but costly. 

Here at Boardworx, we think the Duotone XT mast extension is the best on the market. It has a simple ratchet system for downloading the sail to precisely the right amount of tension. 

Some of the strongest wave and slalom windsurfing extensions are made by Chinook, known for making solid windsurfing accessories.