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Aero MAS Spider for modular ROTOR Direct Mount cranks and power meters. Compatible with 2INpower DM, Inpower DM, ALDHU and VEGAST. For ROTOR 110x4 ALDHU chainrings and 1x and 2x 110x4 ROTOR Aero chainrings. The high quality CNC machined AERO MAS (Micro Adjust Spider) Spider offers for the first time the possibility to use ROTOR cranks with Aero chainrings as closed Aero cranks for 1 and 2 speed drives. The Spider also offers several OCP positions for the 1x or 2x 110x4 Aero chainrings, so that e.g. with the ROTOR Powermeter crank the OCP intermediate positions OCP 3.5 can be set.