Shimano XTR is the top-spec mountain bike range. The absolute finest components that you can fit to a mountain bike for super-reliable shifting and powerful, controllable brakes.
Designed with XC riders in mind, the XTR range has found itself to be massively popular with the trail and enduro riders too. Choosing to retain a cable in order to offer the greatest control over shifting rather than to go electric, Shimano have made a drivetrain that feels better than any other. XTR also incorporates the fantastic hydraulic disc brake selection where you can go for lighter 2 piston or race ready 4 piston options.
Once you ride using XTR, you'll never want anything else.