I am planning an unsupported 7 day tour along the northern CA coast this summer with a pretty light load and do the Everest Challenge (EC) in late September. For the uninitiated, the EC is 200 miles across two days and a combined elevation gain of over 29,000 feet. For these events I am looking for some more gears. I am posting here because I am not really a touring person and ride a bike more like what the folks here ride, sport touring/randonneur bike.
I am currently running full 10 speed Ultegra with a compact double and an 11x27 cassette. I have a rear 9 speed Shimano barcon from a past failed experiment.
My thoughts are to leave my existing 10 speed barcon installed but remove the shift cable. Install the rear 9 speed barcon shifter, a MTB 11x32 9 speed cassette, and 9 speed MTB Shimano derailleur from the take off wall at my LBS. Thoughts on this plan?
My buddy at my LBS feels pretty confident I can run a 32 cassette with my existing Ultegra derailleur despite the fact that the Shimano site states the max sprocket is 28.