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  1. #1
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    Broke off a part of my front derailleur - relevant?

    Hi volks!
    Today I was riding my home trail (https://www.strava.com/activities/1892380440/overview) and at some point during an uphill section I noticed a noise from my drivetrain. Found out it was a plastic piece of my front derailleur (Shimano Deore XT, FD-M8020-D, https://www.bike-discount.de/en/buy/...p-swing-450026) that was hanging into my chainring/chain. It's the part on the bottom of the cage which is secured with a torx screw. Didn't take much and it broke off completely. Since my bike is still shifting smoothly after this procedure I am wondering why it was there in the first place. Does anybody know what it is for? Should I replace my front derailleur or leave it be?

    Thanks for any advice!
    Cheers, Leic

  2. #2
    ninjichor.com
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    It's apparently a chain catcher. Don't know much about it to give any advice, but here's a link to purchase it by itself if you'd like to replace it.

    https://www.aliexpress.com/item/Shim...894259311.html

  3. #3
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    Thanks a lot! I didn't even think about searching for spare parts. Already placed my order on one.

    Cheers!

  4. #4
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    Shimano junk. The clip on the front is what breaks. This allows the chain catcher to pivot down rotating on the screw. It will then rub on your chain as you said. This is a weak/defective design. It's too bad because this is probably the best shifting front derailleur that Shimano has ever made.
    You can epoxy the catcher to the cage if they aren't damaged too severely. Luckily its an easy replacement also. I haven't seen the new Shimano 2x12 in person to see if it has the same design. Beware if it does.
    Last edited by TTTURNER; 10-09-2018 at 09:17 AM.

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