Lightweight and sturdy: The aluminum frame of the Wahoo is robust and durable, yet still light enough to be easily controlled by children.;The closed dropouts with Trek's ThruSkew axle prevent accidental wheel disengagement.;A straightforward 1x8 drivetrain simplifies gear shifts, allowing your children to fully focus on the road ahead.;Trek children's bicycles are an investment in quality - they are built with the same care as the adult Trek bikes.