Shimano Ultegra RD-R8150 12-Speed Rear Derailleur Spincast & Underspin Fill: Cloudloft Synthetic Insulation

Fill: Cloudloft Synthetic Insulation

Steel axle with cartridge bearings and a roller bearing

The remarkable and exclusive Membrane Inflatable Technology (MIT) and high-tenacity nylon face fabric create a comfortable

and the Ultralight certainly earns its label

Shimano Ultegra RD-R8150 12-Speed Rear Derailleur Spincast & Underspin Fill: Cloudloft Synthetic InsulationThe Fastest Ultegra Shifting To Date Shimano Ultegra RD R8150 12 Speed Rear Derailleur is more versatile than ever thanks to a single cage length option compatible with 11 28, 11 30, and 11 34 cassettes. It also packs the fastest, most precise shifting out there into a more affordable option. This rear derailleur is updated with Shadow technology. Shadow tech is made with a low profile design and single tension construction, so the derailleur does not