Take a quick look at the new x-dome™ eagle™ cassette. The last dangling shred of an argument in favor of a mountain bike front derailleur is now officially dead. Designed for use with our proven reliable xd™ driver body this 12-speed 10- to 50-tooth cassette offers an optimal 500-percent gear range at a considerably lighter weight than 2x systems. It carries with it the x-dome™ architecture which independent tests have concluded yields the strongest cassettes on the market. New shifting characteristics improve both inboard and outboard shifting as well as chain retention. - speed (cs): 12s - gearing: 10-50t - cog finish (cassette): gold - technology (cassette): xg - cog sizes: 10-50t:101214161821242832364250