Shimano XT M771-10 10 Speed Cassette
The addition of a massive 36 tooth cog is one of the key features of Shimano's new 10 speed Dyna-Sys range of drive trains.
The big advantage to the 36 tooth cassette is that you'll be able to stay in your middle and big rings longer meaning that you'll ultimately be shifting less. Who would have ever thought more gears would equal less shifting?
Please Note:This cassette can only be used in conjunction with Shimano Dyna-Sys series components. Dyna-Sys was designed from the ground up to be used as one complete unit and parts from previous generations cannot be mixed and matched.