Join Date: Apr 2006
Location: Orange County CA
Bikes: Surly CC, Raleigh Team Pro, Specialized Rockhopper with an xtracycle
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I'm pretty sure you can only find 8/9/10 cassettes for this wheelset. With that said, once you figure out the cassette you are going to want, you will have to get the accomanying chain and throw the shifters into friction. If you ever want to go sti, you can use your 600 sis rear derailleur without a problem. Are you thinking STI?
FYI.. i think that your current 7speed wheels might only be a freewheel and not a cassette??