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high stiffness and long durability
They accomplish this stability while being 20% lighter than standard metal spring systems
Proprietary TR-Speed compound provides confident
This densely woven fabric is also lightweight and highly flexible
Shimano Ultegra Rear Derailleur Di2 12Spd RD-R8150 grips high stiffness and long durabilityDescription 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
