Micro Balance G-Bike The Swiss-designed Micro Balance G-bike is probably the most innovative runner bike ever, perfect for preschool children learning to balance and ride. The Micro Balance G-bike offers exceptional quality construction, award-winning design with minimum weight; the g-bike+ weighs half as much as comparable models so it can be easily carried by hand or with a stroller as needed. The Micro Balance G-bike is slightly taller than the original g-bike by micro and the handlebar and saddle are adjustable for additional height. The rubber knob is there to protect kids from injuries. The Micro Balance G-bike has larger 200mm wheels of highest quality polyurethene and is slightly taller than the original g-bike. The Micro Balance G-bike is as much an indoor toy - the wheels won't leave any black marks on the floor. It is a mode of mobility for even the youngest child, indoors and out!