Front derailleur for aluminum Fatback- Mtbr.com
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  1. #1
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    Front derailleur for aluminum Fatback

    What type of front derailleur does the aluminum Fatback take? Is it the Shimano E-type or a SRAM bolt-on version that is compatible? Thanks!

  2. #2
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    Shimano E-type
    -Chris

  3. #3
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    does the problem solvers bolt on adapter work for the Fatback? (same device Mukluk uses)

  4. #4
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    Probably. I just got one for my Pugsley that came without the mounting tab for an e-type. The direct mount adapter comes with a bunch of shims that allows use on several seat post sizes. I also bought an XT direct mount derailleur for $10.50 from Jenson. Pretty good deal.

  5. #5
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    Quote Originally Posted by zombinate View Post
    does the problem solvers bolt on adapter work for the Fatback? (same device Mukluk uses)
    I don't think it will work. Both my Fatbacks, my older Ti and my wifes newer alu, have a post coming sideways out of the seat tube to mount the E Type Derailler to. I suspect it would have to be cut off to allow the problem solver bracket to fit. For me it would not be worth the trouble as the E Types work great.

  6. #6
    Dr Gadget is IN
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    While the AL fatback does have the E-type extended post, that derailer is a "top" swing. The direct mounts are "bottom" swing, so their mount is up higher on the seatpost. Based on my understanding that the name means where the cage is on the linkage.

    Here's a comparo pic:


    You can see the post hole in the FD-M770-E vs where it's shifting body is - then compare to the FD-M771 bottom swing at the top. Looks like it would clear.

    As stated before, the "E" derailer works fine - at least with a 44t big ring. If you want more teeth, a bottom swing will be more valuable since the cage actually moves up as it moves out.
    This isn't a "you're doing it wrong" topic.

    WSS/OSS: Open Source Sealant

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