One of these..

http://www.chainreactioncycles.com/M...?ModelID=29904

Used but in 100% perfect working order..

Universal mount, fits any crankset..

Mr Control DH Chain Device suitable for Downhill & Dual Slalom.

• For use with ring sizes 36T - 44T
• Universal Mount (Not ISCG)
• Colour - Black

Looking for €20

PM only please