Eccentric bottom bracket insert allowing the use of internally geared hubs, single speed or fixed gear set-ups on bikes with horizontal dropouts without the use of a chain tensioner.
To fit a CrMo BB Shell with the dimensions: 59.9mm outside diameter x 61mm wide with inside diameter 55.63mm
Aluminum Eccentric bottom bracket dimensions: 54.75mm outside diameter with a relief cut to 61mm body width. The BB boss extends out from the 61mm dimension to the full 68mm BB assembly width.
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