Shimano Ultegra RD-R8150 Di2 2x12-Speed Rear Derailleur Brand_iGPSports 20 lm (flashing mode)

20 lm (flashing mode)

positioning all parts of the bike within reach for any mechanic whether seated or standing

it works with any bike frame

Edged shoulder studs for good grip and control in curves

OPENSWIM(Formerly Xtrainerz)

Shimano Ultegra RD-R8150 Di2 2x12-Speed Rear Derailleur Brand_iGPSports 20 lm (flashing mode)SHIMANO ULTEGRA Di2 Rear derailleur SHIMANO SHADOW RD 2x12 speed RD R8150 Now simplified with a single derailleur cage length, the new 12 speed Shimano ULTEGRA R8150 rear derailleur packs our fastest, most precise shifting into a more approachable option. With our fastest, most accurate shifting, the new 12 speed ULTEGRA R8150 rear derailleur is more versatile than ever thanks to a single cage length option that is compatible with 28 34T low