The Sunrace MZ903 Black Superlight 11-51 12-speed cassette is designed to expand the gear range of SRAM 12-speed drivetrains, offering a reliable and lightweight solution for MTB use. The black finish provides an elegant and discreet aesthetic, suitable for modern and well-maintained builds.

The sprockets from 11 to 39 teeth are made of Hi-Tech steel to ensure durability and wear resistance, while the larger 39-45-51 tooth sprockets are constructed from 7075 Ergal, reducing the overall weight without compromising solidity. The aluminum lockring and spacers also contribute to keeping the casse...