Light and sturdy: The aluminum frame of the Wahoo is robust and durable, yet still light enough to be controlled effortlessly by children.;The enclosed dropouts with Trek's ThruSkew axle prevent accidental wheel detachment.;A simple 1x8 drive system simplifies gear shifting, allowing your young riders to fully focus on the path ahead of them.;Trek children's bikes are an investment in quality - because they are built with just as much care as the adult Trek bikes.