The specialized crux expert x1 cyclocross bike 2018 holds true to its racing pedigree delivering a fast confident amp light weight ride that39s guaranteed to give you a competitive edge rider first engineered has been implemented into the crux family ensuring that every single frame size meets the same high standards of stiffness amp weight the frame itself has received several key improvements over it39s predecessors beyond a much lighter frameset the crux has had its rear end