Vision 386 EVO Track crankset
The Vision Track crank is a revolution in track crank design with an ultra-stiff 30mm spindle, oversized solid forged aero arms optimized for rigidity, an aerodynamic solid dish spider and a deep-tooth 49T chainring.
Aka "The Chicago Rotor".
No, you can't use a Sram GXP bottom bracket with these, or Phil Wood OBB, or Chris King Threadfit 24. You must use the FSA MegaEVO linked to in the specs.