WTB's KOM i21 Rim is made to go fast on every trail. They are ultra light and wide so you can be first to the top and ready to turn it around and rip down while your buddies are still looking for their lungs. It's made from WTB's exclusive WT69 aluminum and features a 21mm width that gives a great shape and footprint to any tire. rubber. Plus, it boasts WTB's Tubeless Compatible System which means with their tubeless-ready rim strip (sold separately), you can run a tubeless-compatible tire for easy conversions, minimal weight and maximum traction out on the trail. Whoever said it ain’t easy being king… was slow.