Shimano GRX RD-RX820 Shadow+ 12 Speed Rear Derailleur - Rear Derailleur - 12 Speed - Black - Long Cage - 2x12 - 36T Max Envelope Shipping This cassette also uses Aluminium

This cassette also uses Aluminium spiders for further weight savings and to prevent freehub wear

LED Type: 2 x Cree LED's provide up to 1100 lumens

Fixing bolts included

increased bushing overlap for improved small bump performance

breathable slip-on glove with excellent bar feel and classic good looks

Shimano GRX RD-RX820 Shadow+ 12 Speed Rear Derailleur - Rear Derailleur - 12 Speed - Black - Long Cage - 2x12 - 36T Max Envelope Shipping This cassette also uses AluminiumThe RD RX820 is compatible with 11 34T and 11 36T 12 speed cassettes, providing a wide gear range so you can spin a comfortable cadence no matter the terrain type. The SHIMANO GRX 12 speed rear derailleur also features an integrated chain stabilizer that delivers quieter shifting and more secure chain management during rough rides. And the chain tensioner has an ON OFF switch for outings on smooth surfaces.