Chain Suck - The Causes And How To Fix It

I demonstrate chain suck, and talk about what causes it, and how to fix/prevent it.
Chain suck is where the chain doesn't disengage from the chain ring, and wraps up the back of the chain ring up towards the front derailleur. This usually happens while shifting gears from one ring to another and usually while there is some load on the chain. Some of the main causes are a dirty drivetrain, poor lubrication, worn drivetrain, or a chain/chainring combo with mismatched wear.

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