When you're in the middle of an all-day epic, big-ringing through nasty terrain, you need unwavering confidence in your machine. The confidence to know that whatever conditions you come across your components will deliver perfect function. You need Shimano's XTR Trail 10-Speed Components Kit. This high-end kit is powered by a gorgeous double or triple-ring Hollowtech II crank spinning 10 titanium/aluminum gears out back. Those gears are tied together and clicked through with a MTB-specific chain and legendarily smooth XTR derailleurs and shifters. And since all that exquisite speed is nothing without control, the XTR Trail disc brakes generate gobs of lightweight stopping power that can be precisely rolled on and off with single-finger effort.