Advertise on Bikeforums.net



User Tag List

Results 1 to 13 of 13
  1. #1
    Junior Member critking's Avatar
    Join Date
    Apr 2010
    Location
    Oceanside, CA
    My Bikes
    Road n Mtn
    Posts
    9
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Braze on front derailleur

    I have a Carbon Fiber frame with a Braze on front der. My problem is that the braze on clamp has some play on it and my LBS is telling me there is no way to fix it since it is connected to my frame with rivets and not screws. Does anyone know any bike manufuctoring company or a GOOD bike shop in the US that may able to fix this? I bought it second hand and the frame is brand new so I don't know where the Original owner bought it from or if there's a warranty.

    I have attached a pic of the braze on. please help. returning it to original manufactorer is not an option.
    Attached Images Attached Images
    "Get over it, it's just a hill"

  2. #2
    Senior Member
    Join Date
    Apr 2009
    Location
    New Rochelle, NY
    My Bikes
    too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
    Posts
    22,395
    Mentioned
    66 Post(s)
    Tagged
    1 Thread(s)
    You have a number of choices. First of all there are any number of skilled shops through the country that can fix this, even though your LBS doesn't know how. If you prefer to have a shop do the work, PM me & I'll give you a referral.

    If you want to DIY you can carefully drill out the head of the rivet, remove the braze on, push the rivet through and drop it out the seat tube, and use two pop-rivets to put it back together.

    If you'd rather try something less drastic, you can wick some glue between the braze on and the frame then hold it tight and steady with a clamp or winding multiple turns of string and let it set for as long as the glue requires. If the gap is very small, Loctite makes a number of retaining products (not the familiar thread grades) including one that expands as it cures,which might solve your problem.
    Last edited by FBinNY; 09-02-10 at 07:18 PM.
    FB
    Chain-L site

    An ounce of diagnosis is worth a pound of cure.

    “Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

    “One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

    WARNING, I'm from New York. Thin skinned people should maintain safe distance.

  3. #3
    Junior Member
    Join Date
    Aug 2010
    Posts
    13
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    If it were me (i dont know much...) id drill out the rivets and put in two new pop rivets then get some 1-2" carbon fiber tape and epoxy it over the mount to make sure its pretty much permanent

  4. #4
    Senior Member CACycling's Avatar
    Join Date
    Feb 2008
    Location
    Oxnard, CA
    My Bikes
    '08 Fuji Roubaix RC; '07 Schwinn Le Tour GS; '92 Diamond Back Ascent EX
    Posts
    4,449
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Is the seat tube round (hard to tell for sure from the pics)? If it is, I'd see if you can finsd a braze-on adapter clamp the right size and eliminate the bracket completely.

  5. #5
    Bianchi Goddess Bianchigirll's Avatar
    Join Date
    Apr 2009
    Location
    Camp Hill, PA
    My Bikes
    Too many to list here check my signature.
    Posts
    20,685
    Mentioned
    46 Post(s)
    Tagged
    1 Thread(s)
    we don't normally have issues like this on good old fashioned steel bikes I would do as the first two suggest but also use some epoxy too
    Bianchis '87 Sport SX, '90 Proto, '90 Campione del Fausto Giamondi Specialisma Italiano Mundo, '91 Boarala 'cross, '93 Project 3, '86 Volpe, '97 Ti Megatube, , '90 something Vento 603,

    Others but still loved,; '80 RIGI, '80 Batavus Professional, '87 Cornelo, '09 Motobecane SS, '?? Jane Doe (still on the drawing board), '90ish Haro Escape

  6. #6
    Senior Member
    Join Date
    Aug 2005
    Location
    Pittsburgh, PA
    My Bikes
    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
    Posts
    26,135
    Mentioned
    12 Post(s)
    Tagged
    0 Thread(s)
    If you want it done professionally, contact FBinNY for his recommendations. Also Craig Calfee (www.calfeedesign.com) specializes in repairing damaged carbon frames and they are one of the best known companies for this type of work. They are also in California and could be relatively convenient to you. Here is their contact info:

    Calfee Designs
    783 San Andreas Road
    La Selva Beach, CA 95076
    Toll Free: 1-800-965-2171

  7. #7
    Senior Member
    Join Date
    Oct 2008
    Posts
    231
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Shadow7874 View Post
    If it were me (i dont know much...) id drill out the rivets and put in two new pop rivets then get some 1-2" carbon fiber tape and epoxy it over the mount to make sure its pretty much permanent
    This is what I'd do if it was my bike, but then again I don't mind if my bikes look "personalized".

    Actually, I forgot how much I hate braze-on derailleur mounts. I'd probably just drill it out, reinforce the area with a bit of carbon tape and epoxy, then replace the whole thing with a clamp-on.

  8. #8
    Junior Member critking's Avatar
    Join Date
    Apr 2010
    Location
    Oceanside, CA
    My Bikes
    Road n Mtn
    Posts
    9
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks for all of your comments. I will definitely look into a CF manufacturer. I have no clue on how to drill a wall much less a CF bike. The seatpost is not round so a clamp on will not work.
    "Get over it, it's just a hill"

  9. #9
    Pro Paper Plane Pilot wunderkind's Avatar
    Join Date
    May 2009
    Posts
    1,624
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The last thing you want is over drill it and cause fracture to the plastic.... err I meant CF. The seat tube after all do carry alot of your body weight.
    Vancouver Modern Portrait Photography

    Zenfolio.com membership discount code: UBV-HJY-SCY

  10. #10
    Senior Member
    Join Date
    Aug 2005
    Location
    Pittsburgh, PA
    My Bikes
    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
    Posts
    26,135
    Mentioned
    12 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by critking View Post
    The seatpost is not round so a clamp on will not work.
    This is the usual reason manufactures use braze-on tabs for the front derailleurs these days and, unfortunately, there is no easy alternative.

  11. #11
    Senior Member
    Join Date
    Feb 2005
    Location
    Oklahoma
    My Bikes
    Trek 5500, Colnago C-50
    Posts
    9,197
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Looks to me as if it needs to go back to the factory for warranty work.

  12. #12
    Old fart JohnDThompson's Avatar
    Join Date
    Nov 2004
    Location
    Appleton WI
    My Bikes
    Several, mostly not name brands.
    Posts
    13,093
    Mentioned
    13 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Bianchigirll View Post
    we don't normally have issues like this on good old fashioned steel bikes I would do as the first two suggest but also use some epoxy too
    I had a customer insist on having a braze-on mount on his 753 frame. I told him Reynolds did not recommend this, but he was insistent. So it went on. A few month later the frame came back: he had jammed his chain in the front derailleur and the mount tore the seat tube open like a can opener. That was the end of that frame.

    Oh, and +1 on the epoxy, as long as it is compatible with the CF tubing.

  13. #13
    Junior Member critking's Avatar
    Join Date
    Apr 2010
    Location
    Oceanside, CA
    My Bikes
    Road n Mtn
    Posts
    9
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Well I'm glad I found a bicycle company near me that specializes in Carbon Fiber. CYCLART.COM will have my bike back in a week, Won't have to deal with taking my bike apart and mailing! Thanks for all your post! See you guys @ a crit near you!
    Last edited by critking; 09-10-10 at 11:34 PM.
    "Get over it, it's just a hill"

Posting Permissions

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