Shimano GRX RD-RX812 Shadow+ 11 Speed Rear Derailleur - Rear Derailleur - 11 Speed - Black - Mid Cage - 42T Max Replace Images Preps surface for use with

Preps surface for use with TLR-1

Narrow Wide tooth profile eliminates chain drop with the perfect chain mesh fit

On sandwich and hamburger models there is a new black hard density compound that is more resistant to big impacts and shares the impact to a wider area of the lower density foam

make the Arch MK4 your best choice for all-around riding

Shimano GRX RD-RX812 Shadow+ 11 Speed Rear Derailleur - Rear Derailleur - 11 Speed - Black - Mid Cage - 42T Max Replace Images Preps surface for use withWith 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.