4-Jeri Single-Speed Chain Tensioner

- Convert any vertical dropout frame with derailleur hanger to a singlespeed - Spring loaded arm keeps tension on chain, Pulley axle adjusts to optimize chainline - Chain retention hoop prevents chain derailment

4-Jeri Single-Speed Chain Tensioner
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Details

- Convert any vertical dropout frame with derailleur hanger to a singlespeed
- Spring loaded arm keeps tension on chain, Pulley axle adjusts to optimize chainline
- Chain retention hoop prevents chain derailment