The GRX RX717 derailleur in combination with a 10-51 teeth 12-speed cassette provides gravel riders with the speed, range, and durability to conquer any gravel challenge. With integrated automatic shock absorption, a shock-resistant shape, and sturdy guide rollers, this derailleur withstands harsh impacts while maintaining its lightning-fast shifting performance. Additionally, it features the same battery as the derailleurs GRX RX827, XTR M9250, XT M8250, and DEORE M6250, allowing you to interchange batteries between your mountain bike and gravel bike.