Specialized Fuse M4 Frameset Mountain Bike

The Fuse’s M4 aluminum frame is loaded with smart touches. The wide-diameter down tube boosts stiffness. The low-slung top tube gives you the clearance to throw the bike around on tight trails. Adjustable dropouts let you run the Fuse geared or single-speed. Those same dropouts also let you adjust the chainstays by as much as 15 millimeters, lengthening the rear end for more stability or shortening it up for quick, nimble manners.