Advertise on Bikeforums.net



User Tag List

Results 1 to 19 of 19
  1. #1
    Junior Member
    Join Date
    Oct 2005
    Posts
    24
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Broken Chainstay 3 Times Please Help

    hi i have 2003 Kona Kahuna frame with a few 2005 upgrades

    i like to sometimes hop on my rear wheel but when i upgraded to disc brakes all the pressure goes to the left (rotor/caliper) side of the chainstay

    i snapped the original chainstay with 6" rotors on and i snapped another 2005 replacement chainstay within 2 weeks with the same rotors, so i upgraded the rotors to 8" and it seemed to have lasted a little longer but the 3rd chainstay also snapped.

    any ideas why this is happening ? or how to prevent it without stopping fun ?

    i think it may also have something to do with rear suspension activating when it snaps..

    any help is appreciated. and here are some photos of my bike
    http://members.shaw.ca/phoenix4eleven/CHAINSTAY1.JPG
    http://members.shaw.ca/phoenix4eleven/CHAINSTAY2.JPG
    http://members.shaw.ca/phoenix4eleven/CHAINSTAY3.JPG
    http://members.shaw.ca/phoenix4eleven/CHAINSTAY4.JPG

    Thanks

  2. #2
    Senior Member Brian's Avatar
    Join Date
    Nov 2004
    Location
    Between the mountains and the lake.
    My Bikes
    8 bikes - one for each day of the week!
    Posts
    16,745
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Isn't this more of an XC bike? Sounds like you're putting loads on the stay that it was not designed for. What does Kona say about the problem? I'm sure they advice against the 8" rotor too.

  3. #3
    Junior Member
    Join Date
    Oct 2005
    Posts
    24
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    they say don't do anything other than XC riding, but that's dumb.. i wanna do what i want when i want the brake side should have more support because the brakes are only on one side these days

  4. #4
    Senior Member Brian's Avatar
    Join Date
    Nov 2004
    Location
    Between the mountains and the lake.
    My Bikes
    8 bikes - one for each day of the week!
    Posts
    16,745
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Do some free-riding too, maybe a little DH action.

  5. #5
    Junior Member
    Join Date
    Oct 2005
    Posts
    24
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    i do... crazy drops and everything

  6. #6
    53 miles per burrito urban_assault's Avatar
    Join Date
    Sep 2001
    Location
    Ft Worth, TX
    My Bikes
    Land Shark, Trek 1000, Iron Horse Rogue
    Posts
    1,486
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Buy another bike.

  7. #7
    Senior Member
    Join Date
    Oct 2005
    Posts
    5,434
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    There is no way the brake is breaking the chain stay. The rear wheel will lock up well before it generates enough torque to break the chain stay. I would check the rear drop out spacing. If the stays are too far apart, then when you tighten the rear wheel, the stay is already stressed and hopping may be enough to snap the stay.

    Another thing to try is go back to a caliper brake and if that solves the problem. It is so easy to lock up the rear even with a caliper, isn't a hydraulic disc a bit of overkill?

  8. #8
    Senior Member Brian's Avatar
    Join Date
    Nov 2004
    Location
    Between the mountains and the lake.
    My Bikes
    8 bikes - one for each day of the week!
    Posts
    16,745
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    My sarcasm has been wasted.

  9. #9
    53 miles per burrito urban_assault's Avatar
    Join Date
    Sep 2001
    Location
    Ft Worth, TX
    My Bikes
    Land Shark, Trek 1000, Iron Horse Rogue
    Posts
    1,486
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    if he didn't learn the first two times, what makes you think he would understand sarcasm?

  10. #10
    'Mizer Cats are INSANE Mentor58's Avatar
    Join Date
    May 2005
    Location
    Clarksville, TN
    My Bikes
    C-dale T800
    Posts
    808
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I have the exact same problem when I do huge drops with my cervelo R2.5 Carbon. Cheap bikes, never let me have any fun.

    Steve W.
    Who has never tasted big air without a parachute, and doesn't intend to begin now.
    *Surly LHT ... Slow and Steady, *Motobecane Century Pro ... Better than Me
    *Bianchi Volpe ... Well, just 'cuz , Fuji Track SS / Fixie ... Mustache bars and a big grin
    Rans F5
    Easy Racers Tour Easy
    * Now that I'm 'Bent, I will probably unload all but the Fixie.

  11. #11
    Senior Member Brian's Avatar
    Join Date
    Nov 2004
    Location
    Between the mountains and the lake.
    My Bikes
    8 bikes - one for each day of the week!
    Posts
    16,745
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Obviously, it's breaking because he's not jumping high enough.

  12. #12
    Junior Member
    Join Date
    Oct 2005
    Posts
    24
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    lol yah i need the brakes for when i go to the mountains or my local ravine to do some drops ect.. anyway

    i will get a coiler frame and hop on the rear for a few hours till it snaps haha i will prove kona wrong, that XC bike has nothing to do with the problem

  13. #13
    53 miles per burrito urban_assault's Avatar
    Join Date
    Sep 2001
    Location
    Ft Worth, TX
    My Bikes
    Land Shark, Trek 1000, Iron Horse Rogue
    Posts
    1,486
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Sometimes one must look to themself for the answers...
    Last edited by urban_assault; 10-31-05 at 04:01 PM.

  14. #14
    Senior Member Brian's Avatar
    Join Date
    Nov 2004
    Location
    Between the mountains and the lake.
    My Bikes
    8 bikes - one for each day of the week!
    Posts
    16,745
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Could be a problem with one of the pivot points, but if an XC bike is being used for freeriding and DH, all bets are off. That frame was simply never intended for that kind of abuse.

  15. #15
    Junior Member
    Join Date
    Oct 2005
    Posts
    24
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    why can't they just give me a stay with the one side all steel.. that would fix everything

  16. #16
    Senior Member Brian's Avatar
    Join Date
    Nov 2004
    Location
    Between the mountains and the lake.
    My Bikes
    8 bikes - one for each day of the week!
    Posts
    16,745
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by urban_assault
    Sometimes one must look to themselves for the answers...
    I agree. It will take a broken collar bone for him to see the truth.

  17. #17
    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
    25,766
    Mentioned
    7 Post(s)
    Tagged
    0 Thread(s)
    I believe it was the Navy that said: "there is always the 3% that doesn't get the word."

  18. #18
    I drink your MILKSHAKE Raiyn's Avatar
    Join Date
    Jul 2002
    Location
    St. Petersburg, FL
    My Bikes
    2003 Specialized Rockhopper FSR Comp, 1999 Specialized Hardrock Comp FS, 1971 Schwinn Varsity
    Posts
    15,071
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by intelcrash
    why can't they just give me a stay with the one side all steel.. that would fix everything
    Why can't you get a clue and stop using an XC bike for things it's NOT DESIGNED FOR?

  19. #19
    Senior Member Brian's Avatar
    Join Date
    Nov 2004
    Location
    Between the mountains and the lake.
    My Bikes
    8 bikes - one for each day of the week!
    Posts
    16,745
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Save your keystrokes, Raiyn. He doesn't get it.

Posting Permissions

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