The ABUS HiDrop is the perfect MTB helmet for such missions

4 x 15mm nylon shims

Flathead Screw Driver

Don't let your chain get too worn

Microshift XCD 11 RD-M865M 1x11 Speed Rear Derailleur - Rear Derailleur - 11 Speed - Black - Medium netsuite-webdata-created The ABUS HiDrop is theXCD Rear Derailleur 11 Speed Clutch As the top of their line of Shimano compatible rear derailleurs, XCD uses their highest end construction and features for a truly high end shifting experience. Features Reliable ratchet and pawl clutch keeps your chain stable and is easily adjustable and repairable Direct path cable routing for smooth and responsive shifting Compatible with 11 46T 11 speed cassettes Aluminium medium cage XCD is all about packing