SLF Motion Aero Derailleur Pulley Wheel Oversized Cage for Shimano DA R9200 Ultegra R8100 11/12S R8000 R9100 R8050 R9150

SLF Motion Aero Derailleur Pulley Wheel Over-sized for Shimano Ultegra 8100 & Dura Ace 9200When efficiency AND aerodynamics are critical, our AERO System is the top choice for many! Utilizing a 14-Tooth / 18-Tooth pulley wheel combination, the AEROSystem isunmatched 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 atrade-off of decreased durability, decreased shifting performance, or even taking an aesthetic step backwards (current offerings on the market). SLF Motion Oversize Syst use cages produced 100% real carbon fiber (unlike competing brands' nylon plastic "composite" cages) along with unique coated bearingsfor added durability and performance. Improve your current stodrivetrain or even your current competing Oversize System with the installation of an SLF Motion AEROSystem.Model: 921 AEROCompatibility: 12sp - Ultegra 8100 & Dura Ace 9200 (Max Caette Size: 34T)Material: Cage made by Carbon fiber, pulleys is Aluminum alloy made 14-18T.Weight: 105gModel: 891 AEROCompatibility--11sp - Ultegra 8000/8050 & Dura Ace 9100/9150(Max Caette Size: 32T)Material: Cage made by Carbon fiber, pulleys is Aluminum alloy made 14-18T.Weight: 105g