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  1. #1
    mtbr member
    Reputation: Hoban's Avatar
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    Welding disc mounts on older frame?

    My buddy has an older Gary Fisher Sugar that we would like to tig some disc post mounts onto it to update the brakes. Trek would do it for $500.

    Anyone do this? Where would we source the parts? Thanks!

  2. #2
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    Welding disc mounts on older frame?

    Whoa! I'd rather just get some nice cantilever brakes instead, that's brutal.

    Wouldn't any hand builder be able to do this? Come to think of it, sanding measuring, welding, priming, painting and then the brakes/wheels to go along with it once the work is done it sounds like it'll be an expensive process anyway even if you found an alternative to Trek.

  3. #3
    mtbr member
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    Nice and cantilever brakes are sort of antonyms in my dictionary...

    It gets wet here. Plus you can't beat hydraulics IMO.

  4. #4
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    Welding disc mounts on older frame?

    I don't disagree with you

  5. #5
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    It looks like there may be some factory bolt on mounts for it. Be nice to sv e the paint back there. Just need to find the exact year...

  6. #6
    Nouveau Retrogrouch SuperModerator
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    Welding disc mounts on older frame?

    Quote Originally Posted by Hoban View Post
    It looks like there may be some factory bolt on mounts for it. Be nice to sv e the paint back there. Just need to find the exact year...
    This is what you need
    http://www.ebay.com/itm/Rear-disc-br...item2c6d1d430d
    mtbtires.com
    The trouble with common sense is it is no longer common

  7. #7
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    Unless you can heat treat it when you're finished, it's a bad idea.

    Read: To the Point: Heat Treating Aluminum Frames - Pinkbike

  8. #8
    mtbr member
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    Thanks Shiggy. I'll have him take a look at his drop out, see if it'll be compatible.



    Berkley, thanks for that. I do know it won't be too hard for us to heat treat back to T6.

  9. #9
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    So I assume you know the bike isn't worth this amount of attention and just want to do this for fun. Taking that as a given:
    -Make the PMs yourself. That's dead easy. If you can heat treat aluminum, you darn well better to be able to drill and tap a couple of pieces of rod.
    -Use an Avid mech caliper as your disc tab fixture (ie install on another bike, clamp down the brake pads to hold it all together, remove caliper/wheel from bike and then install on your Sugar to use as a jig). Or make a jig.
    -Weld her on.
    -Heat treat.
    -Go ride.

    Personally, I would spend my energy making something else and just ride the bike as is.

    -Walt
    Waltworks Custom Bicycles
    Park City, UT USA
    www.waltworks.com
    waltworks.blogspot.com

  10. #10
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    the welder you use has a big impact on this. i've welded aluminum frames before and always used a miller syncrowave. lincoln and hobart make similar units but you really want to have some skill in being able to weld thin aluminum. 100% argon and quality rod along with a steady hand should make it fairly easy to do. i would not try to mig an aluminum frame ever.

    also note i have never heat treated a welded area or had a crack after. one was even on a pk ripper back when i was 15 and rode bmx. the re weld of the head tube was actually stronger than the OE weld. at least it seemed like it was. i cracked the OE weld but never did the re weld

    not saying heat treating is a bad idea by any means but the rear disc bracket location is in a non stressed area of the frame.

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