Rotor ALDHU Track crank arms, spider & axle,Aero MAS Spider | Rotor America,ALDHU 3D+ Spider Mount Crankset Builder | Rotor America,ALDHU/VEGAST Track 30 Axle + Spider | Rotor America,Just fyi, the Rotor track axle/spider is just mildly press fitted and glued; easy to separate and swap the axle/cranks with the Rotor INpower DM power meter. About 1200 miles with this