This is one of the many "ebay" carbon bottle cages from China. About $15 delivered to Australia. Weighs 30g. Not super-light but holds a Camelback podium bottle really firmly. Solid design and cheap.
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You can use nutserts or rivnuts to add bottle cage mounts to a bike frame. The mounts on many frames are added like this from the manufacturer (eg. the bottle mounts on my Anthem X ...
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31.6mm full carbon seatpost in 400mm length. Weighs 203g. Looks like a copy of the Ritchey carbon seatpost. Clamp would not be compatible with oval rails.
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The bottle cage mounts on my Anthem X have been getting increasingly loose. After a quick discussion with Joe at Carine Cycles , I decided to attempt a repair myself. It appears on ...