With multiple World Championship medals EWS wins and Olympic gold medals to its name SRAM XX Eagle cranks set the standard now the XX SL Eagle T-Type carbon crank is the pinnacle. Inside it has been engineered with an ultra-strong but ultra-light design that utilizes carbon fiber with a hollow core - still one of the lightest ISO certified cranks on the market maximized for title winning stiffness.XX SL Eagle T-Type crank is an ultra-strong incredibly light hollow-core carbon fiber design that's weight optimized and SRAM's lightest55mm Chainline168mm Q-factorDUB bottom bracket and spacers NOT included