Just wondering if anyone has upgraded their rear derailleur and shifters? Going from the OEM Microshift to perhps Shimano XT or XTR? I became so used to the Shimano mountain "dual-control levers" on my bikes for 12 years, and NEVER liked "thumb shifters/rapid fire" type shifters. Having a difficult time using the Microshift thumb shifters on my RAT. I've also used the "back-wards" shifting "Rapid-Rize" rear derailleur that either you love it or hate it!. Have a nine speed dual-control, lever set and a 9 speed rapid-rize rear der. Thinking of installing them on my RAT and just using the 40 x12 teeth only, of the cassette, (making it a 9 speed). Any input from any trikers out there, please? Thanks ahead of time!