Shimano GRX RD-RX812 Shadow+ 11 Speed Rear Derailleur - Rear Derailleur - 11 Speed - Black - Mid Cage - 42T Max Replace Images Correct use of your bicycle's

Correct use of your bicycle's gears will allow you to fine tune any training session without having to manually adjust resistance

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

Cons: Not compatible with other brands

Who's this item for: These short sleeve jerseys are a great choice for Trail

Preps surface for use with TLR-1

Shimano GRX RD-RX812 Shadow+ 11 Speed Rear Derailleur - Rear Derailleur - 11 Speed - Black - Mid Cage - 42T Max Replace Images Correct use of your bicycle'sWith 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.