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  1. #1
    mtbr member
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    XX1 42 tooth cog issue

    I have noticed an issue with my XX1 42 tooth cog.

    I have a couple climbs in my area that are about 45 minutes long all in 42 tooth cog.

    When I am in this gear, if I back pedal (which I will do to get the pedal to a starting point after a break or getting off for an unclimbable section) the chain drops down to the 36 tooth cog.

    I put the bike on the stand and the same thing happens. Won't stay at 42 tooth backpedaling.

    I adjusted the derailleur perfectly to no avail. I have a 32 front tooth, 168q on a carbon Bronson.

    The chainline angle seems to steep and just wont stay where it should.

    Anyone else noticed this or been able to fix?

  2. #2
    mtbr member
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    That is normal. The fix is not to back pedal too much. A 1/4 turn backward ratchet of the crank to climb something is fine, too much more than that and it will do what you are experiencing. All rear derailleur drivetrains will do this to some extent when you are in the extreme gear combos. A fix would be to space your chainring in closer to your frame, but it would mess up your chain line in he 10 and 12 T cogs in the rear. A 2x10 drivetrain will be less likely to do this, if you avaoid cross chaining.

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