I'm with crax on this, they will tell you when it is time.When they squeak.
Well you are definitely doing something wrong, maybe fiddling with them too much? Never had a jockey wheel bolt come loose and certainly not had any appreciable wear in the life of a chain. Perhaps you should consider reviewing your lube regime?I replace them with every chain and cassette change, I pay special attention to them when cleaning the drive train, the screws sometimes work loose over time, it's always worth checking they are torqued up right.
|Jockey wheels, maintenance?||Bicycle Mechanics & Repairs||54|
|L||Jockey wheel question.||Bicycle Mechanics & Repairs||2|
|Chain slipping with new chain, cassette and jockey wheels||Bicycle Mechanics & Repairs||14|
|J||New chain being throw of Jockey Wheel||Bicycle Mechanics & Repairs||33|