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3rd Eye Chain Watcher
3rd Eye Chain Watcher on Alex's commuter

Third Eye
Chain Watcher

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This product eliminates the possibility of a chain jumping off the smallest chainring and landing on the bottom-bracket shell or becoming tangled in the gears. Great for Cyclocross set ups with a single chainring, but they can work on almost any bike. They mount just under the derailleur clamp, so obvious limitations apply there. You'll need at least 2 inches of available seat tube underneath your front derailleur clamp, and the system aligns evenly with your granny ring, so any obstructions on the seat tube directly across from your granny ring's teeth may present fit problems. Black, 14 Grams.