Shimano GRX-RX810 front derailleur This Shimano front derailleur is specially designed for the Shimano GRX crank. With these cranks, there is a greater difference between the inner and outer chainring than with others. The cage of this derailleur has therefore been extended, so that you can shift quickly and smoothly on the Shimano GRX cranksets. Specifications: Color: silver, black Material: aluminum, steel Type of bicycle: MTB Capacity: 46-50T Number of gears: 11 speed Type of shifting: mechanical Assembly: braze-on Cage: extended Series: GRX Type: RX810