Shimano Ultegra Rear Derailleur Di2 12Spd RD-R8150 over shoes In its third generation

In its third generation

Spare spokes are included with the wheels

Whether it's for changing out of your wetsuit after a surf

compliant and balanced for a wide variety of road riding enthusiasts

the clean lines and straight bars give it a nice

Shimano Ultegra Rear Derailleur Di2 12Spd RD-R8150 over shoes In its third generationDescription Ultegra Shadow design with Di2 technology, shifting is easy and precise just a light touch, as soft as a mouse click, is sufficient for the front or rear derailleur to instantaneously select the correct gear The rear derailleur is now the brains of the system with wireless connectivity to the shifters. It acts as the point the system is charged, provides ANT+ connection to 3rd party devises and replaces the handlebar junction Button on the