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Papapete
Joined: 06 Nov 2008
Posts: 31
Location: Warrington
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 Posted Fri Nov 6, 2009 7:06 pm |
Hi all,
Apologies in advance if i'm asking such a daft question 
I'm about to get myself a new wheelset (opted for the Shimano RS30's over the Fulcrum 5's) and would like to know if I need to stick to the same cassette gear ratio that I currently have - will get LBS to fit it.
I know i need a 9 speed cassette for the 9 speed Sora shifters, but do you need to keep the same gear ratio, currently have SRAM PG95011-26 or can I opt for say a 12-25 or 12-27 (thinking Shimano Ultegra). The rear mech is Tiagra on a triple Sora front.
Thanks
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topdude
Joined: 30 Dec 2004
Posts: 745
Location: Fordingbridge, Hampshire UK
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Papapete
Joined: 06 Nov 2008
Posts: 31
Location: Warrington
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Posted Fri Nov 6, 2009 7:51 pm |
Cheers Topdude
Just had a feeling that I was being a bit thick!! 
I've probably done approx 1000 miles on current chain, what's the normal lifespan? Will I get Winter out of it and possibly change in the Spring?
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John.T
Joined: 12 Nov 2004
Posts: 1747
Location: Harrogate. N. Yorkshire. UK
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Posted Fri Nov 6, 2009 8:31 pm |
If you are happy with the ratios you have then stick with the same cassette but as TD says you can go with any 9sp (SRAM or Shimano). I prefer 12/27 to 12/25 as I find the 23/25 to be too close together. You only use them on the small ring when climbing so why not have the lower gears.
As for chain life I reckon to get at least 2000 miles from a chain. Measure 10 links (10") with the chain under tension. It should be less than 10.1". If more than this the chain is done for. If close I would run it for the winter with the old cassette and change both then. If you intend to change between wheelsets I would fit new cassettes to both as using one old one will accelerate wear on everything.
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FSR_XC
Joined: 29 Sep 2007
Posts: 1534
Location: Cornwall
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Posted Sat Nov 7, 2009 12:53 am |
Personally, as long as you get on with those ratios, I'd stick with the cassette and change both cassette & chain in the spring.
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John.T
Joined: 12 Nov 2004
Posts: 1747
Location: Harrogate. N. Yorkshire. UK
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Garz
Joined: 25 May 2009
Posts: 441
Location: Manchestorh
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