The GALE SPEED rear master cylinder set the piston diameter to diameter of 12 and was designed to match the general racing footpeg lever ratio. This allows for an exclusive and controllable rear brake system. Machined fluid reservoir - brown in color. 6061 3D forged machined body with a T6 heat treatment for strength and corrosion resistance. Adjustable mounting points slide to widen mounting points for universal applications. Piston diameter: 12. Mounting pitch: 49 mm.