The Extreme Light Weight Balance Bike weighs in at just 2.5kg. The magnesium alloy frame and foam tires makes this one of the lightest balance bikes in the world. BALANCE BIKE DIMENSIONS - The seat adjusts as low as 28cm from the ground all the way to 17" tall. The handle bars will adjust from 50cm at the lowest point to 44cm tall. Making this the best option for young beginners learning to ride a bike. SAFETY A MUST - Along with providing the best balance bike at the lowest cost, know that each bike is built and inspected with your child's safety in mind. Each clamp is tamper proof, both wheels equipped with safety washers and each frame build to way exceed the weight limits of even larger children. With rigorous testing with larger children, we are proud of the durability of the latest model. SIMPLE SET UP - Each bike come partially assembled. The wheels are securely attached and ready to ride. Just slide the seat and handlebars in the right position for your child and clamp it down.