Shimano Ultegra RD-R8150 Di2 12 Speed Rear Derailleur bikebox The Ventral Air Mips works

The Ventral Air Mips works to enhance a rider's aerodynamic profile and minimize drag

creating a natural cooling effect that helps maintain an efficient body temperature

meeting everyone’s needs with just two (11:29)

The worlds first laser derailleur alignment tool

For bikes running a 1x Drivetrain with out a front derailleur this blanking plate mounts in place of the bolt on derailleur mount for a more refined look

Shimano Ultegra RD-R8150 Di2 12 Speed Rear Derailleur bikebox The Ventral Air Mips worksNow simplified with a single derailleur cage length, the Shimano Ultegra RD R8150 Di2 12 Speed Rear Derailleur packs Shimano's fastest, most precise shifting into a more approachable option. The single cage length is compatible with up to 34T low sprockets, making it more versatile than ever. Specifications Fastest ever rear shifting 58% faster than RD R9150 Compact design includes an integrated wireless unit, charger and switch LED status indicator