the SHIMANO ALIVIO M3100 rear derailleur delivers a low profile design that lets you ride aggressively with fewer interruptions thanks to its SHIMANO SHADOW design.Low-profile designTotal capacity: 45TMax. low sprocket: 36TAdjustment barrelHollow axle Cable adjuster Compatible chain: CN-HG53 9-speedDirect attachment (Conventional) Fluoric coated link bushings: 1Low sprocket_Max.: 36TLow sprocket_Min.: 32TMax. front difference: 22TSunken type pulley bolt Pulley_Teeth: 11TPulley cage: SGSRear speeds: 9SHADOW RD Top sprocket_Max.: 12TTop sprocket_Min.: 11TTotal capacity: 45T