Shimano XTR FC M9000 Race 11 Speed Crankset 3424T. If minimal weight and maximum performance are your criteria for a mountain bike crankset, look no further than Shimano's XTR FC M9000 Race 11 speed edition. The latest and greatest iteration of Shimano's flagship XTR group is just plain ridiculous in all its features that make it the best money can buy, and in their Rider Tuned design ethos there's two XTR versions: Trail, stouter for all mountain and enduro riding, or this Race edition, super light for cross country racing. Leaving no stone unturned in the quest for lightness, the left crankarm of this XTR 9000 Race features a hollow cavity with hollow bonded construction to shave grams. This crankset boasts the most advanced mountain bike chainrings ever produced, that utilizes a combination of titanium, carbon and aluminum to maximize durability and lightness. With a narrower 158mm Q factor, it's engineered with the pedaling efficiency of cross country aficionados in mind and the close step gearing of the double chainrings and new 11 speed XTR cassette means there's never a big gap in gears when shifting through the range. Perhaps coolest of all, the crankset's modular design means you can run either a 1x or 2x chainring set up to provide incredible versatility and the ability to hone gearing to perfection.