ive gone through 2 cheap cranks, truvativ iso flow 3.0 and shimano alivio, either one wasn't able to last me for more than 2 rides. im looking to upgrade to a stronger crankset and ive come across the FSA gravity standard for a good price. my question is..i have a 3 speed sram x4 derailer and the FSA crank is a 2 ring set..is it possible to run this crank with the derailer that i have or will i have to purchase a new derailer(front and rear) to make this work