Specialized FSR Brose Motor Alloy Crank Spider Description: This Specialized FSR Brose Motor Alloy Crank Spider mounts chainrings to various model Turbo bikes equipped with a Brose Alu or Brose Mag model motor. Features: Genuine replacement Specialized parts For use with bikes equipped with a Brose Alu or Brose Mag motor Spider lockring sold separately Compatible with Turbo Levo, Turbo Vado, Turbo Como, Turbo Kenevo, and Turbo Tero bikes with Brose systems produced after 2016 Specifications: Bolt Circle Diameter (BCD): 104mm Compatible Chainline: 49mm Material: Alloy