
Shimano Alfine CT-S500
The Shimano Alfine CT-S500 is a chain tensioner that mounts on the derailleur hanger of vertical-dropout frames, designed around a 42mm chain line. It keeps proper chain tension on internally geared or single-speed setups where the frame has no way to take up slack itself.
- For use with vertical dropout frames
- Mounts on the derailleur hanger
- Designed for a 42mm chain line
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Shimano Alfine CT-S500
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