I've got a FS frame to build up and I could use some input on cranks. The XT looks like great value and the weight and performance get great press. It sort of locks me into shimano for a BB thou. The xtr is a lot harder to justify. I quite like the look of the middleburn RS8 which falls in the middle price wise. I'm 175lbs/75kg/just under 12 stone and will be riding mostly xc stuff but not racing
The middleburn comes in 175mm only. What other things do i need to consider for length beyond longer = more torque but your feet have to travell farther and faster and may get closer to the ground? The BB is reasonably high off the ground on this frame.