Shimano's experience in machining and engineering allows for exceptional amounts of technology to go into tooth design, shaping, and shifting ramps, known as Hyperglide, and luckily, Shimano does a good job trickling this technology from Dura-Ace down through Ultegra, and here on the 105. Made from nickel-plated steel, the cogs themselves withstand corrosion and are tough enough to hold up to off-road abuse, which provides durability for smooth shifting and longer life. Shimano 105 CS-HG700-11 features a removable spacer for compatibility with MTB hub body.