Lightweight and sturdy: The aluminum frame of the Wahoo is rugged and durable, yet light enough to be easily controlled by children.;The closed dropouts with Treks ThruSkew axle prevent accidental wheel dropouts.;An uncomplicated 1x8 drivetrain simplifies gear shifts, allowing your kids to focus on the fun of riding.;Trek children's bikes are an investment in quality – they are built with the same care as the adult Trek bikes.