Confirm drivetrain wear by using a chain checker tool to measure elongation; replace the chain if it reaches 0.5% wear for 11-12 speed or 0.75% for 9-10 speed systems. Visually inspect the cassette and chainring teeth for a hooked or 'shark-finned' profile, which indicates the components have worn to match an elongated chain and will cause slippage if paired with new parts.
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