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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. 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. Note: This is not designed for downhill, freeride, or big hit use.

- Machined aluminum tensioner bolts on to derailleur hanger - Adjustable spring tension and dual floating pulley - For frames with vertical dropouts - Fits hubs with 22-28Mm chainline (From inside of dropout) - Made in USA

- Machined stainless steel lock ring, extra wide to prevent stripping - Stepped inner edge to tighten even narrow cogs (minimum size 13t) - Made in USA