A bicycle system comprising a suspension (38,34), a chain (19) and a disengageable derailleur assembly (17), the disengageable derailleur assembly comprising: a P-knuckle assembly (510) comprising a clutch plate (635); and a cage assembly (565) having a cage-assembly counterpart (650); wherein the clutch plate selectively and frictionally engages the cage-assembly counterpart based on manual or automatic inputs from the bicycle system: the disengaging occurring when performance is paramount to eliminate the inefficiencies caused by suspension induced chain growth; and the reengaging occurring as needed to ensure the chain stays in an appropriate location to properly propel the bicycle system.