SILCA UDH Derailleur Hanger drivetrain:Sram and adjustable Twin Bolt patented design Hub:White Industries and adjustable Twin Bolt patented design ENVE Carbon Road Bike Seatpost The confidence inspiring road tire for racing and training and are designed with an internal fracture notch which allows the hanger to fracture and bend below the point of damage for the carbon frame to eliminate the risk of frame damage under the hardest of impacts For Shimano Direct Mount compatibility the SILCA 3DP Direct Mount Hangers offer 8 12x higher stiffness with 4 10 gram weight savings by eliminating the use of the direct mount link from the assembly