Q for technocrats

Discussion in 'Bicycle Mechanics and Repairs' started by ozboz, 14 Jun 2018.

  1. ozboz

    ozboz Über Member

    Richmond ,Surrey
    Hi , I have just had a 10 speed 11-36 cassette fitted to back wheel , so I need to have a longer chain , Ive worked it out by numbers ;

    Length of chain stay. 15.75 x 2. 31.5
    Teeth on large CR. 52. /4. 13
    RC large ring. 36. /4. 9
    + 1. 54.5
    So chain should be 54.5’’.

    I don’t want to fit new chain if it’s wrong length

    Any one see a problem here ?
  2. Cycleops

    Cycleops Guru

    Accra, Ghana
    That's the mathematical method. You can cross check by using the physical calculation, big cog to big cog omitting the RD plus two links I think, or is it one?
  3. ianrauk

    ianrauk Tattooed Beat Messiah

    Atop a Ti

    I use the 2 method (1 Link pair)
  4. ianrauk

    ianrauk Tattooed Beat Messiah

    Atop a Ti
  5. raleighnut

    raleighnut Guru

    On 3 Wheels
    ^^^^^^^ same for me.
  6. bpsmith

    bpsmith Veteran

    As above. Works for me every time and very easy to do.
  7. mjr

    mjr Comfy armchair to one person & a plank to the next

    And what's more, it still works if your bike shrinks because you ride it in rain!
    Dogtrousers likes this.
  8. Smokin Joe

    Smokin Joe Legendary Member

  9. pawl

    pawl Veteran

    One if using a master link
    Cycleops likes this.
  10. OP

    ozboz Über Member

    Richmond ,Surrey
    Hi all ,
    Well , all went well !
    Judging by the gap between the jockey and 36 cog the Wolfs tooth has done its jo b well , I’ll be looking at getting my Surly upgraded also now ,
    I went with the numerical method , as a person who has Dyscalculia numbers are my Achilles heel , but with a tape and calculator , easy peasy !! even for me !!
    I did check it out with the app @Smokin Joe posted , there was a 1/2’’ difference , but that was sorted ,
    Last edited: 15 Jun 2018
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