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Worn-out Chain or Cassette: Over time, your chain and cassette teeth can wear down, causing the chain to slip.
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Improper Gear Shifting: Shifting under heavy pressure can lead to chain skipping.
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Chain Length Issues: If your chain is too long or too short, it might jump off the gears.
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Misaligned Derailleur: A bent derailleur or misaligned hanger can lead to inaccurate gear changes and chain jumping.
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Dirty or Poorly Maintained Drivetrain: Dirt and debris can interfere with the chain’s movement, causing it to skip.