Building up a new bump-devouring enduro sled has never been more fun. Rather than agonizing over the cost of pro-level drivetrains, self-sponsored cyclists have the privilege of riding components nicer than what the pros of not so long ago were riding. Shimano's XT drivetrain is a perfect example of this; if XTR's not in the cards, save yourself a giant credit card bill and upgrade to XT instead. The new XT FC-M8000 Crank Arms recently received an opulent upgrade, returning with better bearings and seals as well as XTR's Hollowtech II Construction, ready to barrel through the rough and rocky stuff with poise. Before you pick up the FC-M8000 and start to doubt that it's solid enough to actually withstand the abuse you're about to give it on-trail, think about Hollowtech II. Cold-forged aluminum with a hollowed center establishes an extremely durable structure, while shaving unnecessary weight from the middle of the crank arms. Don't concern yourself with longevity or durability worries, because the FC-M8000's bombproof construction actually makes it stronger than many solid crank arms. Enjoy smoother bearings and seals better equipped to keep out dirt and debris, and rest assured that Shimano's simple thru-axle and pinch bolt design returns to make installation quick and pain-free, once again.