A chain catcher is a cheap and easy way to eliminate a dropped chain, which has the potential to damage a frame.
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Chain Catchers
All are easy to install, and most are fastened with one bolt. The chain catcher is installed with a 2.5mm allen key and installs near the front derailleur.
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Chain Catcher Install
Replace the bolt and spacer in the derailleur with what is provided, once the derailleur is set, put the catcher in place and tighten it down.