This 24" A1 Premium Aluminum frame is built like an adult XC bike with double butted tubing, forged dropouts, and disc-brake mounts. 50mm-travel coil- sprung fork with lockout and preload adjust provides all the tunability your child needs as they work toward the trails. Lightweight 32-spoke alloy rims are double-walled to withstand years of adventures. Knobby Specialized Fast Trak Sport tires give kids a confident start to trail riding. Junior 7- speed crankset with replaceable chainrings for quick, smooth shifts.