LOVE YOUR DRIVETRAIN
Worn out drive trains can be a real pain, resulting in skipping, miss shifts, slow shifts, clunky shifting, and dropped chains. Keep an eye on your chain and change when appropriate. The more often you change your chain, the longer the rest of your drive train will last and perform as it should. A worn cassette will cause slow clunky shifting, especially if you have recently put a new chain on it. Worn jockey wheels will cause slow shifting and these are quite often overlooked, so be aware.