I'm looking to replace my rear cassette and reduce the tooth count between the sprockets in order to make my gear changes less dramatic.
I currently have a 11/26 9 speed SRAM cassette, and a stock shimano tiagra derailleur (whatever the 2011 trek 1.5 comes with). My chainring is a compact 50/34 110mm.
When I'm cruising along I often find that the jump between gears on the cassette is pretty substantial and it feels as though I could do with a missing gear to get the best efficiency with a cadence above 90.
I have my eye on a 12/23 cassette: http://www.wiggle.co.uk/shimano-hg50-9-speed-cassette/ (Shimano HG50). This is a fairly cheap cassette so it's not the end of the world if it doesn't work out, but what I'd like to know is if I can just replace the existing cassette with this one without having to buy a new chain/derailleur etc. Or, if I do need to buy some new stuff - what would that be? New jockey wheels?
I have all the tools to replace the cassette so that's not a problem. My concern is all the talk of 'hyperglide chains' etc.