That will be a 12mm rear axle ( I have the same on my carbon demo). However does this run a 135mm rear end as opposed to the 150mm rear end found on conventional demos? Im sure the s works are reduced. Nice frame btw!
Sorry I thought wrong! Your particular frame is 150mm rear hub spacing and 12mm axle. Its the complete S Works demo (red and black one) that has the 135mm rear hub spacing