A size 20 kids bike is built for independent riders aged 6 to 12 years old (or heights between 4'0" and 4'5"), featuring a strong frame, responsive brakes, and an adjustable seat.Key Specifications & FeaturesWheel Size: 20-inch diameter wheels designed for stability and growing riders.Frame: Heavy-duty, durable steel or lightweight metal configuration built for outdoor use.Brakes: Responsive child-friendly handbrakes or coaster setups for safe stopping power.Adjustability: Height-adjustable seat posts and handlebars to accommodate growth spurts.