Rotor ALDHU 3D Track fixed gear crank arms, spider & axle – Retrogression,ALDHU Track | Rotor America,ROTOR Track30 axle + spider,Buy Rotor Track Axle + Spider 30mm - Black,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,