Cassette/Chain Change

laurentian
laurentian Posts: 2,389
edited February 2013 in Workshop
I suppose this will be blindingly obvious to some, but my first attempt at such an operation so please bear with me.

The cassette on my Specialized is an 8 speed Sora and it's knackered.

Looking at the cassettes available on line, the Tiagra 9 speed cassette is cheaper(!) and why not have an extra gear? thinks I.

I realize I will need an new chain too, but as the rest of the groupset is Sora, am I OK just to swap the old 8 Speed for a new Tiagra 9 speed cassette plus new chain? I realise there will be some setting up to be done with the rear derailleur but apart from that, is it OK?

Thanks
Wilier Izoard XP

Comments

  • sungod
    sungod Posts: 16,556
    no

    the amount the rear mech moves from one sprocket to the next is determined by the shift lever

    your shift lever was designed to work with an 8-speed cassette, not a 9-speed one

    if you wanted to change to 9-speed you'd have to change the shifter to a 9-speed one as well
    my bike - faster than god's and twice as shiny
  • laurentian
    laurentian Posts: 2,389
    Thank you Sungod - you've me a heap of cash and a lot of embarrassment!

    Top man!
    Wilier Izoard XP

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