Advertise on Bikeforums.net



User Tag List

Results 1 to 10 of 10
  1. #1
    Senior Member mudboy's Avatar
    Join Date
    Sep 2008
    Location
    Collegeville, PA
    My Bikes
    Ruckelshaus Randonneur, Specialized Allez (early 90's, steel), Ruckelshaus Path Bomber currently being built
    Posts
    1,353
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    "endless clamp" style braze-on front derailleur clamp?

    I have a Vitus 979 frame. I'm having difficulty finding a decent 1.125" clamp front derailleur that will suit my needs, so I figured I'd just get a braze-on and use an adapter. I have a clamp that should work, but it's loose, so I think the seat tube is actually slightly smaller than normal diameter. Does anyone know of an "endless clamp" type of front derailleur braze-on adapter, sort of like the old SunTour front derailleurs?

    Thanks

    Pete
    --~--~--~--~--~--~--~--~--~--~--~--~--~--~--~--~--
    Ruckelshaus Randonneur • Ruckelshaus Path Bomber
    Flickr Photostream
    FrameBuilderSource.com Framebuilder Database

  2. #2
    slow as I ever was Ex Pres's Avatar
    Join Date
    Dec 2007
    Location
    an imposter living in the 35223
    My Bikes
    see signature
    Posts
    5,459
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Sounds like you have Metric/French sized tubing @ 28.0mm vs. "standard" 28.6mm. Is your top tube 26.0mm (vs "standard"25.4mm) as well?
    Some manufacturers made these slightly smaller clamp-on FDs back in the day, but it sounds like you're trying to use a more modern set-up.
    Wrap some appropriately colored, or clear, vinyl tape around your seat tube.
    72 special CNC ___________ 72 Frejus (ala Legnano) __73 Holdsworth Record
    78 Raleigh Professional_____ 80 Ranson_____________ 80 unknown French (SS)
    82 Peugeot PXN10_________83 Trek 600____________ 85 Gianni Motta
    85 Trek 560______________88 Guerciotti GLX
    90 Miele Gara_____________02 Casati Dardo (g/b\k)___02 Casati Dardo (y/blk)
    03 Casati Dardo___________08 BF IRO (fixed)________10 Vassago Fisticuff (IGH)

  3. #3
    Insane Bicycle Mechanic Jeff Wills's Avatar
    Join Date
    Mar 2008
    Location
    other Vancouver
    Posts
    6,419
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Bob Barker View Post
    Sounds like you have Metric/French sized tubing @ 28.0mm vs. "standard" 28.6mm. Is your top tube 26.0mm (vs "standard"25.4mm) as well?
    Some manufacturers made these slightly smaller clamp-on FDs back in the day, but it sounds like you're trying to use a more modern set-up.
    Wrap some appropriately colored, or clear, vinyl tape around your seat tube.
    Vinyl tape is probably too squishy for a FD shim. I've used a short piece of PVC pipe to shim a front derailleur- it still works fine after several years.
    Jeff Wills

    All my bikes.

  4. #4
    Senior Member cmcanulty's Avatar
    Join Date
    Dec 2006
    Posts
    407
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    For a real skinny shim try a piece of a plastic container or a thin piece of galvanized (less compression but might scratch frame)

  5. #5
    cs1
    cs1 is offline
    Senior Member cs1's Avatar
    Join Date
    Feb 2004
    Location
    Clev Oh
    My Bikes
    Specialized, Schwinn
    Posts
    6,130
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Jeff Wills View Post
    Vinyl tape is probably too squishy for a FD shim. I've used a short piece of PVC pipe to shim a front derailleur- it still works fine after several years.
    What schedule pipe did you use? Everything I see is way too thick.
    1999 Waterford RSE-11, 1995 Waterford 1200, 1989 Specialized Rockhopper Comp
    1989 Raleigh Technium, 1989 Schwinn Traveler, 1986 Specialized Rockhopper
    1984 Specialized Stumpjumper, 1986 Specialized Stumpjumper and just way too many projects to list.

  6. #6
    slow as I ever was Ex Pres's Avatar
    Join Date
    Dec 2007
    Location
    an imposter living in the 35223
    My Bikes
    see signature
    Posts
    5,459
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    What I'm suggesting as tape is the kind you would use for a chainstay guard.
    Even Sch80 pipe would be too thick, irrigation grade pipe, whatever that stuff is called, might be good for adapting a 1 1/4 to a 1 1/8 or something, but that's just ghetto.
    72 special CNC ___________ 72 Frejus (ala Legnano) __73 Holdsworth Record
    78 Raleigh Professional_____ 80 Ranson_____________ 80 unknown French (SS)
    82 Peugeot PXN10_________83 Trek 600____________ 85 Gianni Motta
    85 Trek 560______________88 Guerciotti GLX
    90 Miele Gara_____________02 Casati Dardo (g/b\k)___02 Casati Dardo (y/blk)
    03 Casati Dardo___________08 BF IRO (fixed)________10 Vassago Fisticuff (IGH)

  7. #7
    Senior Member gearbasher's Avatar
    Join Date
    May 2009
    Location
    Sitting on my butt in front of a computer
    Posts
    334
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I had an '80 Motobecane w/Vitus tubing and it came stock with an alminum shim that went only half way around the seat tube. It was just on the backside of the clamp. I never had any slipping problems. The bike is long gone, so I can't tell you the thickness of the shim.
    "Trying is the first step towards failure." --- Homer Simpson

  8. #8
    Senior Member mudboy's Avatar
    Join Date
    Sep 2008
    Location
    Collegeville, PA
    My Bikes
    Ruckelshaus Randonneur, Specialized Allez (early 90's, steel), Ruckelshaus Path Bomber currently being built
    Posts
    1,353
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Yeah, I just measured the seat tube with calipers, and it's 28.1mm, with a French threaded headset (fortunately the frame came with a good Stronglight headset) and a BSC bottom bracket. Freaking French...

    I was going to opt to shim it (probably use a soda can), but was looking at my market bike with an old SunTour front derailleur and wondered why nobody made a braze-on front derailleur mount in that style...maybe I'll email the guys at Velo Orange and see if they want to make one.

    Thanks,

    Pete
    --~--~--~--~--~--~--~--~--~--~--~--~--~--~--~--~--
    Ruckelshaus Randonneur • Ruckelshaus Path Bomber
    Flickr Photostream
    FrameBuilderSource.com Framebuilder Database

  9. #9
    cycles per second Gonzo Bob's Avatar
    Join Date
    Oct 2003
    Location
    Minnesota
    My Bikes
    Vitus Aluminum, DiamondBack Apex, Softride Powerwing 700, "Generic" Ishiwata 022, Trek OCLV 110
    Posts
    1,789
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by mudboy View Post
    Yeah, I just measured the seat tube with calipers, and it's 28.1mm, with a French threaded headset (fortunately the frame came with a good Stronglight headset) and a BSC bottom bracket. Freaking French...
    Wow. What year is your 979? Mine is from 1986 and uses standard 28.6 FD clamp and has standard 1" ISO headset/fork.

  10. #10
    WNG
    WNG is offline
    Spin Forest! Spin! WNG's Avatar
    Join Date
    Sep 2007
    Location
    Arrid Zone-a
    My Bikes
    I used to have many.
    Posts
    5,420
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    +1
    Your's must be early production?
    My Vitus 979 is also ISO fork BSC BB, 25mm seatpost, and takes a 28.6mm FD (Dura Ace mounted on mine).
    “You meet the nicest people on two wheels!"
    I'd rather add more life to my years, than years to my life.

Posting Permissions

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