Quote Originally Posted by Becky View Post

Catriona's suggestion of a SRAM XX cassette has possibilities too. Just keep in mind that a SRAM rear derailleur is not compatiable with a Shimano shifter. Something about the shift ratios being different- I'm drawing a blank here.

*wanders off to check out the part specs on the Madone*
I have no idea and I'm not sure if many people know since sram XX is so new... But I think you could possibly run a shimano mountain bike 9 speed rear derailleur, use the xx cassette (if the 10 speed spacing is the same between the xx and a shimano or sram 10 speed road cassette) and then use it on a shimano shifter.



9 speed shifters won't work with 10 speed cassette - but I'm pretty sure that you can run a 9 speed cassette on 10 speed shifters... You just end up having a ghost shift for the last one. Somewhere on here, debw and or lunacycles were discussing how to do it on a cyclocross bike... It may have been for someone's terry valkyrie that they were getting information on how to build up. So going to a 9 speed mountain bike cassette in the back, she'd probably only have to change the rear derailleur & cassette.