What is this plastic disc for?

Discussion in 'Bicycle Mechanics and Repairs' started by Maz, 16 Apr 2010.

  1. Maz

    Maz Legendary Member


    I'm doing a cassette change...What is this plastic disc for? [it was between the old cassette and wheel] Can I discard it?

  2. ianrauk

    ianrauk Tattooed Beat Messiah

    Atop a Ti
    it's to stop the chain falling between the cassette and the wheel. And yes you can discard it.
  3. OP

    Maz Legendary Member

    Thanks. I've thrown it away...never liked the look of it anyway.
  4. OP

    Maz Legendary Member

    one other thing...do i need to put some grease on the "stubby bit" that the cassette goes on to?
  5. Gerry Attrick

    Gerry Attrick Lincolnshire Mountain Rescue Consultant

    A very thin smear will do no harm and will protect the hub body from corrosion and the cassette from seizing on it.
  6. dave r

    dave r Dunking Diddy Dave Pedalling Pensioner

    Holbrooks Coventry
    I remember them! In the days of friction shifters I usually had one behind the block to protect the spokes, haven't needed one since index gears.
  7. longers

    longers Veteran

    Is it worth checking your mech doesn't go too far towards the spokes now?

    Just push it and see how far it goes.
    Then ask someone else what to do if it needs adjusting :smile:, I have to check the book every time.
  8. OP

    Maz Legendary Member

    Yay! Job done. New cassette/chain.
  9. Alien8

    Alien8 Senior Moment

    I hope you keep the rest of the bike cleaner than your (discarded) dork-disc?!
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