Thanks for all the help! I did a lot of researching before going with keeping the 600 and getting cogs from loosescrews (great people) I must sheepishly admit that what I thought was 13-22 (I just got the bike and had simply looked up the old Bridgestone catalog PDF from Sheldon Brown and went with that. I rode it maybe all of fifty miles before figuring out that I actually have a true corncob 13-18 HAHAHA shame on me ^^ Good news though -13,14,16,19,22,26 is wonderful gearing for the mountains -still have to stand up on some serious grades but over all this bike is so much more fun to ride now!