SRAM XX SL Eagle T-Type Crankset - 170mm 12-Speed 34t Chainring Direct Mount DUB Spindle Interface BLKSRAM XX SL Eagle T Type Crankset 170mm 12 Speed 34t Chainring Direct Mount DUB Spindle Interface Black. 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