The Advent MX E-Series cassette is the smoothest shifting, most durable cassette that we've ever made. That all starts with SpeedRamp, a series of discrete shifting ramps that move the chain quickly, quietly, and precisely under load. The cogs themselves have been upgraded as well: the profile has widened to 1.8mm, and the first seven cogs (11-28) have been constructed using full chromoly steel, helping to outlast even the most robust competitors. SpeedRamp technology delivers faster, quieter shifting Thicker chromoly cogs from 11t to 28t for 500% durability increase over hi-tensile steel Replaceable small cogs extend service life Nickel plated satin finish results in less visible wear Compatible with Advent MX, Advent X and Sword 10-speed systems Compatible with standard HG cassette hub bodies Rated for E-bikes Specifications Range11-48Cogs11-13-15-18-21-24-28-34-40-48Cassette Body TypeShimano HGDrivetrain Speeds10ColorSilver/BlackWeight683Designed for ebikeYesDefined ColorSilverDefined ColorBlack