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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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@coventry_eagle
The hook is to prevent the cage from going above the eye-brow line when secured and the nuts are basically those for the adjusters.
Should have included the link :) http://demonxtreme.com/product.php?xProd=2189
Will be placing an order for them on Monday hence do let me know if you need any.