Find the cassette sprocket that fits your riding style on Ridewill. Since 2001 Dave Weagle and his engineering team have enabled international champions to get more out of their bikes. E * thirteen is a small company focused on creating products for the aftermarket, and its mission is to create components that meet the needs of every driving style. The result is innovative products; lighter, with greater reach, and able to hold the chain firmly in place thanks to a revolutionary tooth design that has made them world leaders. In addition, these sprockets are easy to install, thanks to their compatibility with Sram and Shimano, and easy to maintain, thanks to their modular design. The right balance between performance and reliability, strength and weight at a competitive price.