giving you quick thumb access without compromising your grip over rough terrain

Pressure bleeder allows you to inflate high and bleed to a precise ride pressure

which has 690 points of engagement (P

with steel hardware

lower-pressure traction and comfort

Shimano GRX RD-RX812 11-Speed Rear Derailleur Long Black Orange Seal giving you quick thumb accessWith 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 RX812 rear derailleur is compatible with mtb cassettes with a 42T low sprocket max. Silent and uninterrupted rear shifting on rough terrain Adjustable chain stabilizer prevents chain slapping