* Compatible with Ultra-Shift chains* Nickel chrome finish steel cogs* 180% Increase in torsional stiffness vs Ultra-Drive cassettes* 6 largest sprockets on 2 alloy spiders
* Compatible with Ultra-Shift chains* Nickel chrome finish steel cogs* 180% Increase in torsional stiffness vs Ultra-Drive cassettes* 6 largest sprockets on 2 alloy spiders