No one carries the DogBoy
Join Date: Feb 2004
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Originally Posted by GeorgerinNH
if i get a 10 speed casesste do i need a need derailer also?
IF you have Sora brifters, use of a 10 speed cassette means a serious outlay of money. It also means not getting a cog larger than probably 27 (29 if you go campy).
Let me explain:
The shifter determine cable pull. Cable pull determines how much the derailleur moves. Indexed shifters are set to pull exactly as much cable as necessary to move the derailleur a distance that corresponds to the spacing on the cassette. If you try to use mismatched shifter/derailleur or cassette, you will not be happy.
Going back to your question...if you get a 10 speed cassette($65+), you will need to get a new 105 or better long cage derailleur (to go with your triple up front) ($50 on up). You will also need to purchase a set of 10 speed brifters, and potentially new cables ($200+). After shelling out all that money you will have the exact same gearing range you have right now, with the lowest possible gear of 30-27.
If you want more low gear for hills/loads, you need an 8 or 9 speed system (to match the currently available mountain cogs). For 8 speed (which sora is) all you need is a new derailleur (to handle wider gearing range) and a new cassette (again I recommend 11-34). You might need a new chain but if you avoid big-big it won't be a problem.
For a 9-sp system, you will need the above PLUS new shifters, you WILL need a new chain (9-sp chain instead of an 8-sp chain) and you might need new cables.
I would discourage you from investing in all the 9-sp stuff because by the time you are done you will have spent almost as much as your bike cost initially. Just spend $60 and get a new Deore derailleur and an 8-sp cassette. If you need more gear, then change the cranks. More speeds don't really improve your gearing range, they just reduce the size of the steps you take to get there.