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Conversion to 9 speed

RobRob Posts: 209
Hi, I have an off the shelf Specialized Allez with 8 speed rear cassette. I have Sora 8 speed shifters. The rear derailleur is 9 speed Tiagra. What's to stop me smacking a 9 speed cassette on in place of the 8 speed? Or am I going to need to change the chain/front mech/chainset/shifters? I don't know exactly how the shifters work but they aren't indexed they shouldn't be a problem should they? I realise a narrower chain might have to be fitted, but then how would that affect the front chainset?


  • jazdogjazdog Posts: 223
    Hi Rob

    I changed up to an 8 speed from a 6 on an old racing bike - the narrow chain worked fine on the triple chainset and I didn't need to replace the front mech. I had to change the shifters but that was more because the old ones were rusting and grotty. If they are not indexed you might be ok.

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