Choice 921-Black Motion Aero Derailleur Pulley Wheel Oversized Cage for Shimano DA R9200 Ultegra R8100 11/1

Aero Derailleur Pulley Wheel Over-sized for Shimano Ultegra 8100 & Dura Ace 9200

When efficiency AND aerodynamics are critical, our AERO System is the top choice for many! Utilizing a 14-Tooth / 18-Tooth pulley wheel combination, the AERO System is unmatched by any competitor on the market when it comes to strength, durability, performance, and aerodynamics! Reducing drivetrain friction and aerodynamics does not have to come with a trade-off of decreased durability, decreased shifting performance, or even taking an aesthetic step backwards (current offerings on the market). Motion Oversize Systems use cages produced 100% real carbon fiber (unlike competing brands' nylon plastic "composite" cages) along with unique coated bearings for added durability and performance. Improve your current stock drivetrain or even your current competing Oversize System with the installation of an Motion AERO System.