Please read the Chain Keeper Fit Guide
to determine which Chain Keeper is compatible with your frame.

The Chain Keeper is a chain retention device for bikes with a single front chainring. Mounted in place of a front derailleur, the Chain Keeper clamps around the seattube and surrounds the chain as it engages the crank and prevents it from being thrown.

The Chain Keeper BB attaches to frames with outboard bottom brackets. This allows the Chain Keeper BB to be used with full suspension frames, carbon fiber frames, frames with eccentric bottom brackets, and frames with non-standard tubing.