MST FXX-D Aluminum Gear Ration Adjuster (Red)

The MST FXX-D Aluminum Gear Ration Adjuster is an upgrade for the FXX-D and FMX-D models. The machined aluminum option will help to provide a rigid structure for the drivetrain increasing durability and chassis rigidity, while the available color options will give your ride a custom look that cannot be matched by the stock parts.