Shimano GRX Di2 Rear Derailleur (RD-RX815) cassons Hardened steel bits

Hardened steel bits

Accepted Tire Sizes: 42c - 2

Inner screw fits precisely within the cap

As the edurance riding option

Flexible and efficient switching

Shimano GRX Di2 Rear Derailleur (RD-RX815) cassons Hardened steel bitsWith 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 RX815 DI2 version offers the digital precision of SHIMANO electronic shifting and synchronized shifting. and is compatible with road cassettes with a 34T low sprocket max. Features Silent and