I recently bought a Fuji Touring Series V that has a stock front SunTour MounTech derailleur and a non-stock Shimano Deer Head rear derailleur. I recently threw a pair of 700c Shimano RSX hubs and Mavic Rims. I am entertaining the idea of upgrading the rear cassette to a larger gear range as well as a pair of MicroShift bar end shifters. I just don’t know how compatible all this is and what I can use and what I can’t use.