Shimano GRX RD-RX822 Shadow+ 12 Speed Rear Derailleur - Rear Derailleur - 12 Speed - Black - Long Cage - 1x12 - 51T Max NoAusPost and the single-layer palm is

and the single-layer palm is mapped with laser hole perforation for breathability

4")Battery included (size CR2032)

Pockets Position and Quantity: There are 3 substantial rear pockets on the Cargo Base Layer for carrying anything you want

please view your frame's manual

Shimano GRX RD-RX822 Shadow+ 12 Speed Rear Derailleur - Rear Derailleur - 12 Speed - Black - Long Cage - 1x12 - 51T Max NoAusPost and the single-layer palm isWith its integrated chain stabilizer and medium cage, the SHIMANO GRX rear derailleur delivers quieter shifting, better ground clearance and more secure chain management in rough terrain. The RD RX822 SGS is compatible with 10 51T, 12 speed SHIMANO MTB cassettes, and the chain tensioner has an ON OFF switch for easy wheel removal.