Bikedued,
Sounds like something didn't attach, cuz I don't see the alternate wheels. Sheldon has rx100 listed as 97 which would make it 8-9-10 speed compatible and 130 width. I've had a 7 speed cassette (shimano) and I did a freehub transplant to bring it up to 8, where it happily carries an older xtr cassette on my 82 schwinn voyager 11.8. How can I help? What was the question again?