SHIMANO ULTEGRA Di2 Shadow Rear derailleur helmet Perfect for when you have

Perfect for when you have no hose or bucket around

and new shifting logic for smooth

thoughtful build choices

It helps add variety into your fueling without compromising the absorption rate of the carbohydrates

synergistic blend of esters coupled with aerospace quality based oil lubrication

SHIMANO ULTEGRA Di2 Shadow Rear derailleur helmet Perfect for when you haveNow 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 R9150