The Buddy BMW Pedal Go-Kart features an adjustable seat, BFR system, pneumatic tires, and a swing axle. The adjustable seat is perfect for children ages 3-8 since it can be adjusted to grow with your child. The BFR (brake, freewheel, reverse) system makes pedaling easy for all children. With safety in mind, the pneumatic tires, and swing axle makes sure that all 4 wheels stay on the ground making any terrain achievable.