Crown gears OPI is extremely lightweight (8 arms) 50-34 made in a forging process 3D and finished by CNC milling. In addition to looking incredibly beautiful, the unusual design also offers excellent values for rigidity. The Spider fits all cranks ARE Hollowgram Cannondale.There is a formula that Cannondale use to help their sponsored riders win races and win titles championship: System Integration. Cannondale reduces the weight, improves the rigidity and uses less moving parts compared to other competitors.Description of Cannondale OPI 8-Arms Spidering KP407 50/34Very lightweight OPI chainring spider (8 arm) made in the 3D forging process and brought to completion by CNC milling. Besides the incredibly beautiful look the unusual design offers also excellent rigidity values. The Spider fits to all Hollowgram Cannondale cranks.Theres a formula Cannondale use to help their sponsored riders win races and take championship titles: System Integration. Cannondale shaves weight, improves stiffness, and use fewer moving parts than other competitors.