Anybody know the best size for my RaceFace Turbines. At the moment i have a 113mm in, but after riding the other day my Knees feel a bit dodge. Dont know if it is that or the fact that i haven't ridden the MTB for some time only the road bike, and the difference in pedal systems is causing it. I have got Time Atac pedals on the MTB and Look Delta's on the road bike. Thanks. :?