Ultegra Di2 RD-R8150 12 Spd. Abus GX provides the widest 2x11

GX provides the widest 2x11 gear range available

Now simplified with a single derailleur cage length

6 and 8mm hex wrenches

PU laminate over mesh upper

Compatible with Red

Ultegra Di2 RD-R8150 12 Spd. Abus GX provides the widest 2x11Now 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 sprockets. FEATURES Our fastest ever rear shifting, 58% faster than RD R9150Compact