Excellent Quality Shimano Alfine CT-S500 Chain Tensioner

Allows the use of an internally geared hub on a frame with vertical drop-outs.

• Chain Tensioner
• 20 tooth max rear sprocket
• 16 tooth chainwrap capacity
• 41.8mm chainline
• Uses washers on on the mounting bolt for 5mm of chainline adjustability
• Compatible chain – 3/32″