Wow. Thanks. This is all very useful, and it's making me wonder if my 42 cm bars are too wide. I'm currently off the bike with neck spasms, shoulder irritation and median nerve irritation. I wonder, tho', if it really IS the handlebars, as all of my ailments are on one side only.

GLC1968 - did you have pain in both arms or just one?

My shop has offered to re-fit me to the bike. I may take them up on that, and focus on the handlebars, as that is one of the major components I recently changed on the bike.