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  1. #1
    mtbr member
    Reputation: iwantalitebike's Avatar
    Join Date
    Jun 2009
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    203

    bike fit question

    I have a bike fit question. First, I have never been professionally fit on my bike, and always just went for comfort and a racey posture. My question is when im peddaling hard and at a high pace (90-100 rpms) the back of my bike is bouncing. My hips look like there pretty level and square. They don't seem to be moving. Ive tried the seat up a little, down a little, forward and back. Just cant get it just right. Im comfortable but i think im wasting energy.
    What are your thoughts????
    I ride a bike, therefore I am!

  2. #2
    It's about showing up.
    Reputation: Berkeley Mike's Avatar
    Join Date
    Jan 2004
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    12,737

    It is hard to do a fit online


  3. #3
    Fat-tired Roadie
    Reputation: AndrwSwitch's Avatar
    Join Date
    Nov 2007
    Posts
    18,453
    Full suspension bike? Sometimes that's caused by changes in chain tension as you pedal. "Pogoing."

    Does it happen on a hardtail or a road bike?
    "Don't buy upgrades; ride up grades." -Eddy Merckx

  4. #4
    g3h6o3
    Reputation: PissedOffCil's Avatar
    Join Date
    Oct 2007
    Posts
    3,707
    If the back of the bike is bouncing, I'm supposing a FS. What you experiment is called "bob" and is fairly common. A lockout or platform shock is the usual remedy. Not a fit problem.
    Check out my SportTracks plugins for some training aid software.

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