Advertise on Bikeforums.net



User Tag List

Results 1 to 7 of 7
  1. #1
    Senior Member
    Join Date
    Oct 2002
    Location
    Fair Oaks, CA USA
    My Bikes
    96' DeRose SLX, '04 Cervelo P2K, ~'80 Schwin converted to fixie, '04 Jamis Nova
    Posts
    205
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Front brake instability

    I picked up a set of Jet2000 wheels for a tri next month. I am riding them a bit to get the feel for tubulars and the wheel. Everything is great, except one thing.

    During moderate braking the front end shakes/lunges. It feels like my headset is loose, but I just made sure that was not the case last night.

    Could having to much toe on the brake pads do it?

    TIA
    Reverend Dr. Jay
    MySpace

  2. #2
    Senior Member BikerRyan's Avatar
    Join Date
    Dec 2002
    Posts
    306
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Sounds like your rim may have some inconsistency in the braking surface. Try scrubbing the brake track with an sos pad or cleaning it with some alcohol. Be careful with the alcohol since your tires are glued on - it could dissolve the glue causing a weaker bond than it needs which could spell rolloff during a corner. Also try sanding the brake pads a little to give them a new surface. One other thought, I am not familiar with the particular set of wheels you have but if the rims are carbon (with no aluminum brake track) then you need special pads in many cases to get optimal performance with the brakes.

    -Ryan
    Your bike mechanic is wise beyond your wildest dreams.

    If you can't be good at one sport then you can be okay at three.

  3. #3
    Senior Member
    Join Date
    Oct 2002
    Location
    Fair Oaks, CA USA
    My Bikes
    96' DeRose SLX, '04 Cervelo P2K, ~'80 Schwin converted to fixie, '04 Jamis Nova
    Posts
    205
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thank you sir, I will try that.

    No, a major thing for my wheel purchase was to have a non-carbon braking surface.

    I am getting down there as far as pad goes, so I might pick up a pair tonight and swap them out and see. I have a bike race this weekend so I need to do it soon to make sure everything is great. Might have to run the regular spoked wheel for the race.
    Reverend Dr. Jay
    MySpace

  4. #4
    Senior Member
    Join Date
    Oct 2002
    Location
    Fair Oaks, CA USA
    My Bikes
    96' DeRose SLX, '04 Cervelo P2K, ~'80 Schwin converted to fixie, '04 Jamis Nova
    Posts
    205
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Scrubbing the braking surface helped, but it is not perfect. I am going to try adjusting my brakes a bit more and see if it will go away. It did not do it before, so I imagine I just need to realign the pads.

    It was so bad on the ride home the other day that my hands fell off the bars. It just shook the bike like crazy.
    Reverend Dr. Jay
    MySpace

  5. #5
    MaNiC! NZLcyclist's Avatar
    Join Date
    Feb 2003
    Location
    Hamilton, New Zealand
    My Bikes
    2004 Cervelo Soloist 105, 2005 Apollo Apex, 2006 SCOTT Speedster S30
    Posts
    1,601
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Definitly check the toe-in and the orientation of the pads (direction)
    You could try asking your LBS mechanic.

    Brendon
    Scott Speedster S30
    Shimano 105 Shifters and Derailleurs
    FSA Energy 50/34 Compact Cranks
    Spinergy Stealth PBO Race wheels
    Sram OG 1070 casette

  6. #6
    Senior Member Bike Spokesman's Avatar
    Join Date
    Dec 2001
    Location
    Toronto Canada
    Posts
    70
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    If you are experiencing the shudder at a certain part in the wheel and once a rotation, the wheel probably has a weld that isn't smooth at the rim joint. I had, in fact still have this problem on one of my training wheels, but due to it's age, I"m not able to do anything about it, but if this is your problem, you might want to look into warrenty. If however the shudder is inconsistant, and your headset is tight, I agree with everyone else, check the brake pad set up.

    Good luck.

  7. #7
    Senior Member
    Join Date
    Oct 2002
    Location
    Fair Oaks, CA USA
    My Bikes
    96' DeRose SLX, '04 Cervelo P2K, ~'80 Schwin converted to fixie, '04 Jamis Nova
    Posts
    205
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Brake pads are facing the right direction, unlikely they would be wrong since the are the orignal pads from when I got the bike last October.

    I have not tried out the wheels since cleaning off the braking surface. I did not want to chance having a braking problem during a hilly race.

    Bike shop is the last option, but might be the only choice.
    Reverend Dr. Jay
    MySpace

Posting Permissions

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