Base Extensions - RDM Diameter US Cup
The Base Extension is used to achieve proper tension and luff length of sails. It has a pulley system and cleat to downhaul and secure tension. They are available in two diameters; Standard (STD) and Reduced Diameter (RDM), two connection types; Euro Pin and US, two constructions; Aluminum and Carbon, and extension length options; Short, Medium and Tall for up to 48cm (STD) and 45cm (RDM) of adjustment.

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Streamlined RDM Carbon Ext US
Streamlined RDM Carbon Ext US
New Carbon RDM extensions from Streamlined features their unique perpendicular pulley and cleat assembly. US
MSRP from: $149
Chinook Carbon RDM Extension US
Chinook Carbon RDM Extension US
These Chinook carbon mast extensions fit US bases and RDM masts.
MSRP from: $115
Chinook RDM Aluminum Extension US
Chinook RDM Aluminum Extension US
These Chinook aluminum mast extensions fit US bases and RDM masts.
MSRP from: $68