GRX RD-RX812 1x11 Spd. Ultegra Di2 Also available with contrast-defining HiPER

Also available with contrast-defining HiPER lens and photochromic lens

6061 alloy

Extension Length Adjustment:  150mm-305mm (Center of Basebar to Tip)

Max Life® Fabric

An integrated quick release mechanism allows for fast tuning

GRX RD-RX812 1x11 Spd. Ultegra Di2 Also available with contrast-defining HiPERWith 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