Te mortuo heres tibi sim?
Join Date: Aug 2004
Location: East coast
Bikes: hardtail, squishy, fixed roadie, fixed crosser
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no need to change the cage size. stick with a medium. x.9 vs. x.0 totally depends on how much money you want to shell out. x.0 is for sure made to tighter tolerances/lighter, and seems to be as tough. depending on your bike and gearing setup, you may even be able to run the short cage. what front rings are you running, and what frame.
i stick with x.9 purely for personal budget reasons. i average about one ganked rear mech a year, and would rather replace the cheaper x.9 then the more expensive sibling. would the x.0 be more durable, and last me longer? IMO, not where/what/how i ride. at least not enough to be worth the extra dough to me.