Sram xx1 1x11 speed drivetrain bundlethe xx1 drivetrain is the ultimate in sram 1x11 speed technology whether you are climbing the steepest mountains or racing down the fastest descents this drivetrain can deliver to the highest levels that are mechanically possible as advanced as this drivetrain may be the simplicity and beauty in the design make it easy to shift smoothly and to maintain use our start below button to personalise your sram xx1 1x11 speed drivetrain bundle