Niner knows that there's a place for carbon fiber, but there's an equally large place for aluminum, especially when you're valuing toughness over the . 02 ounces you'll save by spending 100 more. The Trail Stem is a burliness first stem designed for rugged riding, particularly on longer travel bikes. Its aluminum alloy construction can take a beating like you won't believe, and the four bolt faceplate clamps onto your 31. 8mm like an angry starfish onto a rock. Niner gave the Trail Stem a zero degree rise, the better to keep your weight back for rugged downhills, and hooked up three colors so you can match it to your whip.