Heres the catch, I have upgraded my Spinergy to 10 speed Ultegras,..I have an Ultegra 9 speed cluster and a Sora Brake/Shifter (leftover from another training roady i sold) as well as other multiple bike parts (leftover upgrades from my BH, almost only the frame is left original, even that is not secure ha ha ha) now can I build a 9 speed running gear using the Sora Brifters? I plan to build a training bike for rainy and trashy weather. I know that Sora Brifters are only up to 8 speed but my mate said it doesn't matter and it can still do it. Whats the real deal? Thanks for your replies in advance.