Shimano 8 speed cassettes help

Discussion in 'Bicycle Mechanics and Repairs' started by Zoom, 6 Jan 2008.

  1. Zoom

    Zoom Über Member

    I have an Rx-100 8 speed set up; last year the rear mech destroyed itself so I replaced it with a 105 9 speed which works fine. I have now bought a Tiagra compact chainset and am after a new chain and 13-26 Hg 70 cassette to go with it; it seems they only make HG50 now (Tiagra equivalent). I had problems changing when I was using the 13-23 cassette. Has anyone experience of the Hg-50? is it just a bit heavier or a fundamentally different cassette (ie doesn't have the special cogs to aid shifting?)
     
  2. Steve Austin

    Steve Austin The Marmalade Kid

    Location:
    Mlehworld
    Shouldn't be any real noticeable difference from what you been using tbh.
     
  3. OP
    OP
    Zoom

    Zoom Über Member


    that's what I thought; I'm sure I've used hg50 in the past but not sure on which bike (my other one was 7 speed RSX), well at £14 it's worth a go. Thanks :biggrin:
     
  4. Steve Austin

    Steve Austin The Marmalade Kid

    Location:
    Mlehworld
    you do know they are very cheap here

    Cassettes are very similar until you get to the Dura-ace/XTR range which get fancy ti sprockets, but ime they all shift pretty much the same
     
  5. giant man

    giant man New Member

    Location:
    Essex innit?
    Hi zoom I run 8 speed RSX and I recently replaced my cassette with Shimano HG50 13-23 and also new chain, SRAM PC-870.
     
  6. OP
    OP
    Zoom

    Zoom Über Member

    It will be running through a 9 speed chainset and rear mech but AIUI it's ok to use 8 speed with 9 speed drivetrain not vice versa
     
  7. OP
    OP
    Zoom

    Zoom Über Member

    no good; 23T top; I need 26 otherwise I might as well have not bought the compact. Wiggle have got 26T
     
  8. campagman

    campagman Über Member

    Location:
    at home
    Very soon I am going to be changing from Shimano 7 spd to 8 spd. I have bought a SRAM 8 spd cassette from SPA cycles. I read some good reports about them. I have not done it yet so maybe I should not be posting but these cassettes are an alternative.
     
  9. Monty Dog

    Monty Dog New Member

    Location:
    Fleet
    The differences between the HG50, 70 and 90 is often purely down to finish i.e. the plating of the metal, or the increased number of lightening cut-outs in the sprockets themselves to save weight. The shape and profile or the teeth are identical, so functionally there is no difference.
     
  10. Cranky

    Cranky New Member

    Location:
    West Oxon

    I can definitely recommend SRAM PG850 - road and MTB versions.
     
  11. OP
    OP
    Zoom

    Zoom Über Member

    so what Shimano chain should I use with hg50 8 speed?
     
  12. Shi**no chains suck ass! Buy a SRAM or Whipperman reckon.
     
  13. giant man

    giant man New Member

    Location:
    Essex innit?

    Don't go for shimano chains imo. Sram are sooo much better. As in my previous post zoom, I have the PC-870 8 speed chain to go with my HG50 cassette.
     
  14. Steve Austin

    Steve Austin The Marmalade Kid

    Location:
    Mlehworld
    I like shimano chains
     
  15. OP
    OP
    Zoom

    Zoom Über Member

    I just bought an HG70 chain to go with the cassette (which arrived yesterday and looks exactly the same as my HG70 one except the lockring is black not chrome); Decathlon still do them.
     
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