ROTOR Aero Round Rings 1X BCD110x4. ROTOR 1x aero 110x4 spider mount Round ring provide minimal air resistance, reduces drag and allows you to pedal faster with less effort. They are compatible with all ROTOR modular road cranks and power meters including 2INpower, INspider, INpower, ALHDU and VEGAST.

Compatible with 110x4 Spider and Aero Mas Spider.