Sorr y for short reply - on smart phone at moment, but can expand later if necessary.
Shimano changed derailleur movement ratio for mountain groups only with advent of 10 speed. They call it dynasys. All previous derailleurs with exception of older dura ace were 1.67:1 (often cited as 2:1. Forget dynasys ratio at moment but closerto 1:1. Easiest thing for you to do now Iis get a dynasys rear d. Note that road 10 speed is still older ratio and wont work -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
