The RT-MT900 offers stable, smooth, reliable, and consistent braking performance. The temperature during hard braking maneuvers has been further reduced. Shimano XTR M9100: The new XTR continues 27 years of MTB innovation with even more speed, focus, and control. Do you want to push the limits on today’s extremely demanding courses? The new XTR is packed with the technological edge you need to do just that. It will inspire you to get the most out of yourself. Shimano has continued to work very hard since they introduced the very first MTB group 27 years ago. The XTR is compelling proof of that. With its completely new design, it is by far the most advanced MTB group on the market. It is lighter, more comfortable, more robust, and more versatile. At the same time, it converts the rider's power into forward momentum with extreme efficiency.