Shimano Deore XT CS M8100 12 Speed Cassette model madone598h2 Specialized Roubaix Elite Road Bike Specialized Roubaix Elite Road Bike 2007 Whether you are planning on stepping up your XC racing schedule or are an expert enduro racer The Shimano Deore XT CS M8100 12 speed cassette is optimized with rider tuned wide range and close step gear combinations for MTB excellence Shift ramp designs provide fast and smooth shifts by HYPERGLIDE+ technology Light and stiff construction reduces cassette inertia resulting in faster acceleration and increased chain security Designed with a Shimano Micro Spline body that features smaller and more widely distributed splines to limit cog damage on freehub The CS M8100 cassette meets durability requirements for E MTB applications