Shimano Ultegra RD-R8150 12-Speed Rear Derailleur A20 Air Brake System

Air Brake System

we include ribs for extra strength

Durable glass construction makes these combos perfect for the trail

- Gravel inspired lever and bracket ergonomics

It Now has a new soft silicone lip for comfortable drinking and is interchangeable with our coffee and flip straw tops

Shimano Ultegra RD-R8150 12-Speed Rear Derailleur A20 Air Brake SystemThe 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