Shimano SM-AD17 Front Derailleur Clamp Shim Adapter Reducer 34.9 to 28.6 or 31.8
Shimano Front Derailleur Adapter Clamp 34.9mm to 28.6mm. For Use With Shimano Deore, LX, SLX, XT, XTR Derailleurs Only. Part Number: SM-AD17-S 34.9 to 28.6. Part Number: SM-AD17-M 34.9 to 31.8.