i now consider it inevitable that i will upgrade both the wheels and the groupset on my OCR3 and i want to know if this can be done in two stages or if i have to do both at once.<br /><br />i am currently running sora 8 speed and if i upgrade the wheels can i get a hub that is compatible with the current 8 speed casette but also compatible with a 105 9 speed or will i have to upgrade both at the same time?