Giant STP 20 FS Kids Mountain Bike 2026Giant STP 20 FS Kids Mountain Bike 2026 Dirt skills start here. With a lightweight aluminium frame that has a low stand over height, a smooth riding composite fork, and 20 inch wheels, the new STP 20 gives kids the confidence and manoeuvrability they need to start leaning into the turns, shifting their weight, and popping some air. It's all the things that make riding fun. FIT FOR YOUTH The frames low stand over height offers greater balance and