Chain Keeper BB
The BB Mount Chain Keeper attaches to frames with outboard bottom brackets. This allows the Chain Keeper BB to be used with full suspension frames, carbon fiber frames and frames with non-standard tubing.
Chain Ring Size28t to 39t
Mounting Plate Thickness2.5mm↓
Many outboard bottom brackets are designed to have their bearing cups spaced 75.5mm apart.
The bottom bracket shell, 2.5mm spacers, and Chain Keeper BB mounting plate are all counted towards this total width.
The BB Mount Chain Keeper can accommodate a range of chainline measurements and chain rings from 28 to 39 teeth in size.
Weighing less than the lightest road derailleurs on the market, a Chain Keeper can help you cut weight from your bike. Plus, you lose the weight of the shifter, cable and housing, which can be substantial.
The BB Mount Chain Keeper is compatible with frames with 68mm or 73mm shells, and will work with Hollowtech II, MegaExo, Giga-X-Pipe and other outboard bottom brackets, please see our Chain Keeper Fit Guide for more detailed information.
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