Shimano GRX Di2 Rear Derailleur (RD-RX817) Shimano and upper tube strong enough

and upper tube strong enough to withstand 325 foot-lbs of torque

durability and versatility of use

micro-thin coating so your ride is never cut short by foggy goggles

X4 offers precise steering

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Shimano GRX Di2 Rear Derailleur (RD-RX817) Shimano and upper tube strong enoughWith an integrated chain stabilizer mechanism, the SHIMANO GRX derailleur provides a quieter experience and shifting security and precision on mixed terrain. For rides on smooth surfaces, the derailleur features and ON OFF switch for the chain tensioner. The RD RX817 DI2 version offers the digital precision of SHIMANO electronic shifting and synchronized shifting. and is compatible with mtb cassettes with a 42T low sprocket max. Features Adjustable