Foes FXR ISCG replaceable mount doesnt fit- Mtbr.com
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  1. #1
    the fat kid
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    Foes FXR ISCG replaceable mount doesnt fit

    I have an email in to Foes, but in the mean time I would see if anyone else has seen this.


    2010 FXR, replaceable iscg05 mount, 'dont fit!:





    I ride faster than I should.

  2. #2
    the fat kid
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    I got to talk to a guy at Foes and he said that the frame isnt designed to work with the iscg plate. Does anyone else have an FXR that does work? I'm curious to see any differences in these. Thanks!
    I ride faster than I should.

  3. #3
    the fat kid
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    Well, despite the issue, I decided to take it to the next level. To get the ISCG tab to work here, you need to remove part of the webbing on the rear triangle to get that mount to sit. I did a rough cut to sink it down and its been working. This is extremely rough and graphic, yes I cut into the frame, yes I know it could cause future failures, no I'll never sell it to pawn it off on someone else, I love this frame and NEED this to work properly. As you can see in the one picture, I loose the chain into the inside of the crank set and is gouging it fairly bad, that alone set me off and now I just dont care any more, so here's what I have. I also "modified" aka hacked an E13 LS1 chain guide to work with this setup. I'm probably going to revisit that and try different guides out to see if they'll work better. I also need to change the bottom roller to a fat rubber one instead of the sliding roller. I've ridden it and its worked fairly well so far.



    I ride faster than I should.

  4. #4
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    Mine fits: Foes-specific ISCG '05, splined, replaceable thingy.

    However...even tho the ISCG mount does fit, I have yet to find an actual chainguide that is usable when bolted on, usually coz the lower section of the guide fouls the chainstay of the swingarm. (Seems kind-of pointless why they made the ISCG mount...altho Foes did have Gamut make a custom design that works with the 'dropped chainstay' design on the Foes swingarm)

    That's why I ended up using a Bionicon C-Guide chainguide - never dropped a chain once, including heavy backcountry trails in the French Alps (and the guide is really quiet too; and v. light. And low price). I never took the ISCG mount off - it's still there, working as an over-engineered BB spacer...

  5. #5
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    So I pulled the trigger on the FXR, size large in Raw. It should arrive Friday and I will have a shop install the CC headset and fit up the Metric fork.

    I went with the I9 Grade (DH) wheels and some Highroller II DH tires.

    The rest of the build is:
    Reverb Dropper
    XT 10 speed rear with Oneup 42 tooth
    Elixir trail 9 brakes
    SLX crankset with 32tooth RF wide narrow


    I am considering a MRP G3 guide. Should I use the provided ISCG05 adapter, or should I just get a BB mount G3 and skip the adapter?

  6. #6
    the fat kid
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    Quote Originally Posted by JCHKeys View Post
    So I pulled the trigger on the FXR, size large in Raw. It should arrive Friday and I will have a shop install the CC headset and fit up the Metric fork.

    I went with the I9 Grade (DH) wheels and some Highroller II DH tires.

    The rest of the build is:
    Reverb Dropper
    XT 10 speed rear with Oneup 42 tooth
    Elixir trail 9 brakes
    SLX crankset with 32tooth RF wide narrow


    I am considering a MRP G3 guide. Should I use the provided ISCG05 adapter, or should I just get a BB mount G3 and skip the adapter?
    depends on what year frame you have. Somewhere out there on the interwebs, certain guides have been noted as able to fit over others. I cant recall off the top of my head which are which. I dont see why not to try and use the iscg mount.
    I ride faster than I should.

  7. #7
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    I got the 2015. I email Foes and got response back from Dan and Brent that the ISCG mount is the way to go. Also, from other friends riding with the wide/narrow chainring, they said the G3 is unnecessary and that the MRP AMG guide is all I need. I will get one of those for my 32 tooth chainring.

  8. #8
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    I now have a solution for fitting a chain device to our FXR's no modification to the frame. You do need to be handy with a file but it fits and it is solid. If anyone is interested let me know and I will let you know the details.

    I personally had no luck with talking to foes with regards to chain device fitment, I was offered a frame but it wasn't feasible.

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