Advertise on Bikeforums.net



User Tag List

Results 1 to 6 of 6
  1. #1
    Senior Member
    Join Date
    Jul 2007
    Location
    Newcastle Aus
    Posts
    67
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Stripped Threads

    Hi all, I've managed to strip 2 threads, where the rear rack attaches to the frame (to much swapping between the rear rack and my surfboard rack, and not enough attention to the task)

    Whats some solutions.....

    My first thought was to drill the hole out for a bigger bolt.....but could that weaken the frame (substantially)?

    I'll take it to my LBS in the new year, but i thought i'd get some ideas here first

    Cheers,
    Marty
    Last edited by Nitram; 12-16-07 at 06:20 AM.

  2. #2
    Hammer Time C_LOGAN's Avatar
    Join Date
    Mar 2007
    Location
    Australia
    My Bikes
    Paconi, Hillman, Sun Tourer + Mongoose Tetra SX
    Posts
    258
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    photos would help.. it depends on where it is exactly on the frame - there are usually four mounts on a bike which hold a rack.

  3. #3
    Senior Member
    Join Date
    Nov 2006
    Location
    TORONTO , ONT , CA
    My Bikes
    '86 AMBROSI / C RECORD. PINARELLO MONTELLO / FRAME, FORK.
    Posts
    769
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    May I suggest 'threaded inserts'?

    They are similar to 'pop rivets', only instead of breaking off the mandrel, the threads within allow

    the use of a machine screw or bolt. 'Pop rivet', and 'Rivnut', tools are disimilar so that a small

    'kit', for each would be the way to go.


    Regards,
    J T

  4. #4
    Senior Member curbtender's Avatar
    Join Date
    Mar 2007
    Location
    SF Bay Area, East bay
    My Bikes
    Kestral 200 2002 Trek 5200, KHS Flite, Koga Miyata, Schwinn Spitfire 5, Schwinn Speedster, Mondia Special, Univega Alpina
    Posts
    3,064
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Is your rack threaded? Reverse the bolt if you have enough clearance for the chain.

  5. #5
    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
    26,149
    Mentioned
    13 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by J T CUNNINGHAM View Post
    May I suggest 'threaded inserts'?

    They are similar to 'pop rivets', only instead of breaking off the mandrel, the threads within allow

    the use of a machine screw or bolt. 'Pop rivet', and 'Rivnut', tools are disimilar so that a small

    'kit', for each would be the way to go.


    Regards,
    J T
    The problem with "Helicoils", "Rivnuts" and similar inserts is that they require an even bigger installation hole than drilling and tapping the current dropout hole one size larger. Dropouts are almost universally threaded M5x.8 and the next size up would be M6x1.0. If the eyelet doesn't have enough metal for an M6 hole, it certainly won't have enough to take an insert.

    I agree, try reversing the bolt in the current hole and use a nut on the outside. A button head or pan head bolt will minimize the thickness on the inner face of the dropout.

  6. #6
    Senior Member
    Join Date
    Nov 2006
    Location
    TORONTO , ONT , CA
    My Bikes
    '86 AMBROSI / C RECORD. PINARELLO MONTELLO / FRAME, FORK.
    Posts
    769
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Yup!

    Regards,
    J T

Posting Permissions

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