The Chain Keeper is a guide to keep your chain right where it belongs. Mounted in place of a front derailleur, the Chain Keeper works with single chain ring drivetrains using a narrow chain. The chain block surrounds the chain as it meets the chain ring and prevents it from skipping off.
Clamp Size28.6mm, 31.8mm, or 35.0mm↓
The clamp diameter is the outside diameter of the seattube. The seattube must be circular in profile where the Chain Keeper attaches.
28.6mm is equivalent to 1-1⁄8".
31.8mm is equivalent to 1-1⁄4".
35.0mm is equivalent to 1-3⁄8".
The Chain Keeper clamps on to the seat tube of the frame. The portion of seat tube where the clamp mounts must have a circular profile and a diameter of 28.6, 31.8, or 35.0mm, (+/-0.5mm).
Designed with adjustability in mind, the Chain Keeper can accommodate a range of chainline measurements and chain ring sizes.
The Chain Keeper may not work with all frames, please see our Chain Keeper Fit Guide for more detailed information.
Note: This is not designed for downhill, freeride, or big hit use.
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