Upgrading the wheels on your mountain bike is one of the best ways to see noticeable performance improvements on the trail. For your 29er wheel build, take a serious look at the Whisky Parts Co. No. 9 Carbon Tubeless Rim. These lightweight yet strong carbon fiber rims offer considerable improvements to ride quality and rolling speed compared to aluminum rims of the same width. They're a great choice for trail riding and all-mountain exploration, and they come in two different widths based on the range of tires you typically run. Lace them up to your favorite hubs and enjoy a perfect mix of width, weight, and stiffness. The No. 9 36w rim features a 30mm internal width, offering great support and a nice tread profile for tires in the standard width range of 2. 2 - 2. 5in wide. The 40w rim has a 35mm internal width that works well for the high-volume 2. 4 - 2. 8in mountain bike tires that have become more popular on modern trail bikes, though it can handle up to a 3-inch plus tire without any trouble. Both rims feature a hookless bead for an easy and secure tubeless setup, as well as increased impact resistance to rocks and other obstacles on the trail.