Trek Kids’ mountain bikes are the real deal, with light frames, knobby tires, quality parts, durable construction, and dialed adjustable components that can grow with young riders. Adventurous kids deserve a true, trail-ready bike that will take them down the road or off the road with confidence and control. Mountain bike styling is perfect for young adventurers. Lightweight, durable aluminum frame and adjustable crank length lets you change pedal position. Comes with simple Shimano 7-speed shifting.