Advertise on Bikeforums.net



User Tag List

Results 1 to 10 of 10
  1. #1
    Senior Member juicemouse's Avatar
    Join Date
    Mar 2005
    Location
    Happy Valley
    Posts
    813
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Too short brakes?

    I'm trying to install a NOS set of XT-2 cantilever brakes on my bike. It's a Trek hybrid that I've had Avid Shorty 6 brakes on for a while without an issue. The problem that I'm having is that the part of the caliper that slides over the frame boss is significantly shorter on the XTs than it is on the Avids. It's so short, in fact, that the boss protrudes out beyond the caliper when the brake is fully seated on the boss. It's preventing the mounting bolt from seating on the caliper, so the brake is free to move all over the place.

    In the first pic, the brass bushing is the innermost part of the caliper, and the steel boss can be seen sticking out just inside of it. Same exact thing happens on the old Schwinn hardtail I tried it on. Any idea what's up here, or what I can do about it?
    Attached Images Attached Images
    It is my belief that every person in this world has something to teach, and everything to learn.

    In memory of Jim Price (aka. sydney) ...

  2. #2
    cptn. x-chains sidekick gmoneyhobbit's Avatar
    Join Date
    Dec 2005
    Location
    san jose, ca
    My Bikes
    stumpie, xtr, sid, ultimate sd
    Posts
    455
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    you should go down to your lbs and get a slightly shorter set of studs ... take those with you so you get the same thread design.

  3. #3
    "Uh-uh. Respek Knuckles." hypersnazz's Avatar
    Join Date
    Jun 2005
    Location
    CA
    My Bikes
    '06 LeMond Versailles, '04 S&M Beringer, '03 Quamen Bowls, '68 Raleigh Grand Prix (converted to fixed gear)
    Posts
    1,094
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Your LBS should also have shims for just this purpose, too.

  4. #4
    Senior Member juicemouse's Avatar
    Join Date
    Mar 2005
    Location
    Happy Valley
    Posts
    813
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by gmoneyhobbit
    you should go down to your lbs and get a slightly shorter set of studs ... take those with you so you get the same thread design.
    Uhh, the bosses (studs) are part of the frame.
    It is my belief that every person in this world has something to teach, and everything to learn.

    In memory of Jim Price (aka. sydney) ...

  5. #5
    Senior Member juicemouse's Avatar
    Join Date
    Mar 2005
    Location
    Happy Valley
    Posts
    813
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by hypersnazz
    Your LBS should also have shims for just this purpose, too.
    Do the shims go on before or after the brakes?
    It is my belief that every person in this world has something to teach, and everything to learn.

    In memory of Jim Price (aka. sydney) ...

  6. #6
    Senior Member Matt Gaunt's Avatar
    Join Date
    Oct 2004
    Location
    London, UK
    Posts
    2,214
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I think they'd go on after because otherwise the locating pin might not seat properly.

    It's strange that the XTs are so short, though, I didn't have any problems with mine which means that either they are different to yours, or that I would be unable to use Avids in the future, the latter here being well worth remembering.
    Matt
    2010 Kinesis Decade Convert2 Alloy fixie, Miche, Sora Pics soon...
    2008 Kinesis RC2 Scandium/Carbon Road, Ultegra, Ksyrium Elites Pics
    2007 Kinesis Pha5e Scandium hardtail, XT, Revelations, Rockets, M4s, Mavics Pics
    2005 Kinesis RC Scandium/Carbon Road, Ultegra, Ksyrium SLs Pics
    1996 Raleigh Max Steel, Deore XT, SRAM Attack shifters, homemade wheels Pics

  7. #7
    me have long head tube TallRider's Avatar
    Join Date
    Oct 2005
    Location
    Chapel Hill, NC
    Posts
    4,089
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Why do you want to change them out? Are the Avids worn out? If I understand correctly, you're not intending this to be a bling-bike...

    Anyway, the shims may as well go on afterwards. You could alternately grind the braze-ons down half a millimeter if you have the right equipment. If you do it right it won't hurt the threads, and you'll still be able to mount other canti brakes like the Avids.

  8. #8
    Senior Member juicemouse's Avatar
    Join Date
    Mar 2005
    Location
    Happy Valley
    Posts
    813
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by timcupery
    Why do you want to change them out? Are the Avids worn out? If I understand correctly, you're not intending this to be a bling-bike...

    Anyway, the shims may as well go on afterwards. You could alternately grind the braze-ons down half a millimeter if you have the right equipment. If you do it right it won't hurt the threads, and you'll still be able to mount other canti brakes like the Avids.
    I picked up the XTs because I wasn't totally satisfied with the Avids (though they were more than satisfactory) and I wanted to try something different. My hypothesis was that the old, chunky style of brake pad was superior to the new, slim style of pad in the brake squeal department. I was also hoping that the XTs would mount up to the bosses with a little less wiggle than the Avids, but that certainly doesn't seem to be the case.

    I'll give the shims a try. Thanks for the suggestions everyone!
    It is my belief that every person in this world has something to teach, and everything to learn.

    In memory of Jim Price (aka. sydney) ...

  9. #9
    Senior Member juicemouse's Avatar
    Join Date
    Mar 2005
    Location
    Happy Valley
    Posts
    813
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Matt Gaunt
    I think they'd go on after because otherwise the locating pin might not seat properly.

    It's strange that the XTs are so short, though, I didn't have any problems with mine which means that either they are different to yours, or that I would be unable to use Avids in the future, the latter here being well worth remembering.
    I think you're right about the shims going on after the calipers. I found this picture on Sheldon Brown's site that shows a black spacer in between the caliper and the bolt. Not sure if that washer came with the brakes originally though, because I bought mine on eBay and they didn't come with any hardware. Do your brakes have them too?

    Anyway, I think you wouldn't have a problem mounting Avids on your bike in the future if you decided to. They seem to just be designed a little longer than the XTs, but their mounting bolt is beveled to guide the caliper from the end. Hard to explain, but I think it would be fine.
    Attached Images Attached Images
    It is my belief that every person in this world has something to teach, and everything to learn.

    In memory of Jim Price (aka. sydney) ...

  10. #10
    me have long head tube TallRider's Avatar
    Join Date
    Oct 2005
    Location
    Chapel Hill, NC
    Posts
    4,089
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Maybe the XT's were supposed to come with washers originally?

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •