Rearset Brake Question

Discussion in 'Airheads' started by Voltaire, Sep 16, 2012.

  1. Voltaire

    Voltaire Titanium and Ceramic Hipster

    Joined:
    Jun 4, 2011
    Oddometer:
    2,145
    Location:
    Auckland,New Zealand
    My race bike rear brake is not very good.... Its been on my to do list....
    First I was thinking get the pedal and front pivot at 90 degrees.
    Make the front pivot longer.
    Any thoughts?
    cheers.:D
    [​IMG]
    #1
  2. pommie john

    pommie john Long timer

    Joined:
    Apr 9, 2008
    Oddometer:
    1,610
    Location:
    Brisvegas, Australia
    Those angles look all wrong.

    The first thing I would do is shorten the rod and get the lever at the drum nearer to 90 degrees. I lengthened the arm at the brake pedal to get less pedal movement which helped a lot.
    #2
  3. spo123

    spo123 Man About Town

    Joined:
    Nov 7, 2006
    Oddometer:
    1,023
    Location:
    North Shore Mass. USA
    Reverse the rear brake lever, facing UP....Shorten the brake rod and reform to fit.....Adjust as needed.
    RELINE rear brake (and front, if required) with MODERN material.
    Ride and WIN!

    spo
    #3
  4. Wolfgang55

    Wolfgang55 Long timer

    Joined:
    Dec 24, 2006
    Oddometer:
    3,892
    Location:
    Only N flowin river emptying in an ocean
    Question about your bike's special additions. What is that green bottle doing inside your bike's frame area just above your foot peg?

    Good luck w/ your adjustments.
    #4
  5. rheritage

    rheritage Been here awhile

    Joined:
    Dec 7, 2010
    Oddometer:
    384
    Location:
    Savannah, GA
    That is his oil breather catch can I think.
    #5
  6. Jon-Lars

    Jon-Lars Jon-Lars

    Joined:
    Apr 23, 2006
    Oddometer:
    569
    Location:
    Beverly

    It's not the pedal/rod mounting lever angle that is important, but rather the brake rod/rod mount lever angle.

    For the best transfer of force, the brake rod should be at an angle of 90 degrees to the rod mounting lever at both ends of the brake rod, at the point in the linkage movement when the brake shoes make contact with the drum.

    The ratio between the foot lever length and the rod mounting lever determines the amount of effort needed to brake. If you make the foot lever longer you will have more mechanical advantage; if you make the rod mounting lever shorter you get the same effect.

    When on the bike, your foot has a point in it's range of motion where you can apply the most force. Rotate the pedal so that it matches, then move the rod arms to suit. I see you have Tarozzi rearsets: ease of adjustment is their forte'.
    #6
  7. Voltaire

    Voltaire Titanium and Ceramic Hipster

    Joined:
    Jun 4, 2011
    Oddometer:
    2,145
    Location:
    Auckland,New Zealand
    Thanks guys for the input, thats tonights job....
    He is a larger pic of the bike.
    The Green Bottle is Liptons Tea...... I had oil get on the clutch so found some hose in the shed and a bottle in the recycle bin....we're talking budget racing here...:evil
    [​IMG]
    #7