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  1. walton_jonez on

    It’s a chain line thing. You usually don’t ride that gear combo and when you do you probably just shouldn’t pedal backwards.

  2. You’re cross chained in big ring/biggest cog so the chainline is maxed, backpedalling tries to correct it, this is normal.

  3. Typical_Counter3959 on

    cross chaining? You got big ring, big cog. the angle too much in that position, causing tension and pulling down. See if it does it with the chain on the little ring up front.

  4. Greedy_Pomegranate14 on

    You’re cross chaining. Don’t be in the gear combination and don’t backpedal. Look up “cross chaining”.

    There’s nothing derailleurs can do for back pedaling, they can only work when you’re pedaling forwards.

  5. AddendumDifferent381 on

    Cross changing, when back peddling, your chain is trying to get’ lined up’ with your front cog.

  6. Skindiddler on

    Cross chaining. It’s works the same way the derailleur works….the chain will naturally jump to the cog with the path of less resistance from its start point.
    Don’t ride that gear combo or don’t pedal it backwards if you insist on doing it

  7. Sea_Self_6571 on

    It could be a perfectly natural thing like others have said – due to the chain line / natural cross chaining. But, it could also mean there’s something wrong with your drivetrain. It’s hard to tell. I was having the exact same issue with my bike – after I changed my front chain ring + chain + derailleur, this stopped happening.

  8. Yea… you’re backpedalling in crosschain.

    1. Don’t crosschain
    2. If you cross chain, don’t backpedal

  9. I agree with most of the comments that you’re cross chaining. However, this can also happen if you’ve misrouted your chain down to the pulley. Speaking from experience.

  10. When pedaling forward, chain position on cassette is guided by the derailleur position. When pedaling backwards, the position is guided by the chainring. Basically the position is defined by the position that the incoming section of the chain has in reference to the cassette.

  11. Chain line.

    The reason why this happens is is that you don’t have a derailleur on *top* of the cogs feeding the chain onto the correct cog like you do on the bottom.

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