nice idea, poor execution
Join Date: Oct 2009
Location: West Newton, MA
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It works, but only for certain values of the word "work".
If you can accept your shifting sort of working sometimes, go with the alternate routing technique, but don't call it a "serious climbing bike" if you do.
If you want to continue using your shifters, I would use a 10 speed cassette with the wide ratio you're looking for. IRD's 10s mountain cassettes work reasonably well with a Shimano mountain derailleur. SRAM's XX cassette would probably work even better, they just cost a lot more.