When you go Shimano XTR, that's movin' on up, Weezie. XTR components use Shimano's top level shifting technology, and the XTR RD-M986 Rear Derailleur will show you a new level in smooth, precise, and reliable shifting. Dnya-Sys is Shimano's dynamic system technology that performs under even the most brutal torque. Shadow plus design and direct cable routing keeps the profile down and therefore less prone to damage, and a combination aluminum/carbon/steel design keeps durability high and weight down.
*GS model recommended for 2x10 cranksets