Advertise on Bikeforums.net



User Tag List

Results 1 to 8 of 8
  1. #1
    Senior Member
    Join Date
    Jul 2008
    Posts
    561
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Front derailleur clamp too big!

    I just bought a SRAM Rival front derailleur, stupidly assuming that the 31.8 clamp would fit my seat tube. It's too big. Is there any kind of shim I can put in there? Or do I just need to buy a new front derailleur?

  2. #2
    Senior Member
    Join Date
    Jul 2008
    Posts
    561
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Just found a shim on Universal Cycles. I guess that answers my question.

  3. #3
    Great State of Varmint Panthers007's Avatar
    Join Date
    Sep 2008
    Location
    Dante's Third Ring
    Posts
    7,481
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    I just got a Shimano XTR in 34.9mm for my bike. It came with adapters to allow it to fit both the 28.6mm and the 31.8mm. So the objects do exist. Maybe ask your LBS if they have some of these. They might give you one.
    How do you keep an idiot in suspense?

  4. #4
    Spelling Snob Hobartlemagne's Avatar
    Join Date
    Dec 2005
    Location
    Plano, Texas
    My Bikes
    Panasonic DX4000, Bianchi Pista
    Posts
    2,863
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The FD is one of the cheapest components. Consider buying the correct size.

    The first rule of flats is You don't talk about flats!

  5. #5
    STFD mcgreivey's Avatar
    Join Date
    Jul 2008
    Location
    North Bergen, NJ
    My Bikes
    '80 Windsor Carrera Sport, '02 Specialized Sirrus A1, '10 Giant Escape 2
    Posts
    778
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Just cut up some old inner tube and wrap it 'round and 'round until it's the right diameter. Not.

  6. #6
    Senior Member
    Join Date
    Mar 2004
    Location
    portland or
    Posts
    1,888
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    go get some metal shim stock. should be able to get it locally.

  7. #7
    Senior Member
    Join Date
    Apr 2008
    Location
    A Latvian in Seattle
    Posts
    1,020
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I like P7's suggestion. Seems like all the FD's I've bought have come with an adapter or two, which I just toss in my probably-never-use box.

  8. #8
    Insane Bicycle Mechanic Jeff Wills's Avatar
    Join Date
    Mar 2008
    Location
    other Vancouver
    Posts
    6,925
    Mentioned
    22 Post(s)
    Tagged
    0 Thread(s)
    If all else fails, Schedule 40 PVC pipe has a 1/16" wall thickness. It makes a perfect shim for a front derailleur that's one size too big. A 1 1/2" long piece works perfectly.

    I bought a wrong-size front derailleur (doh!) and used a PVC shim to make it work. It's still there, working perfectly, 6 years later.
    Jeff Wills

    All my bikes.

Posting Permissions

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