The Shimano XT BR-M8120 is a four-piston disc brake caliper that builds on the success of the BR-M8020 and benefits from the trickle-down of technology from the XTR model

Who's it for:  Home mechanics doing bearing replacements and maintenance on their hubs

Nylon and spandex blend

This derailleur mod will position your jockey wheels in the optimum position to provide maximum chain wrap in the smaller cogs

Available options:

PNW Components Rainier 27.2mm Replacement Cartridge Kit - 110mm Do Not Ship Internationally The Shimano XT BR-M8120 isIf you have the PNW Components 27. 2mm diameter Rainier dropper post and need to replace your air cartridge then this is what you need. The replacement air cartridge is for the 27. 2mm diameter Rainier dropper posts only and is available in 110mm, or 90mm drop options.