The new XTR is suitable for a wide audience, thanks to the idea "for your driving style," and new innovations such as new drive 10-speed MTB Dyna-Sys. XTR - for your driving style! We proudly present: Dyna-Sys 10-speed drive the next generation of Shimano MTB. The aim of developing a system of Dyna-Sys was not the introduction of shift system further increased the number of gears. Shimano aim was to develop solutions that will benefit cyclists: Dyna-Sys ... is not only an extra gear a smaller spacing between gears for smoother shifting and better transmission of force Gear combinations are optimized for better efficiency and durability everything that concerns the effectiveness of: Dyna-Sys offers a more stable drive for every cyclist Description: double-breasted Down Swing increased availability of modern MTB providing lightweight hollow cells