Lightweight and sturdy: The aluminum frame of the Wahoo is robust and durable, yet light enough to be easily controlled by children. The closed dropouts with Treks ThruSkew axle prevent the wheels from accidentally falling out. A straightforward 1x8 drivetrain simplifies shifting, allowing your offspring to focus on the fun of riding. Trek's children's bikes are an investment in quality - as they are built with the same care as the full-sized Trek bikes.