My son is 22 months and very active. So, we thought it must be a new impeller ago (we have one plastic from BIG). Have PUKY tested extensively in a huge Radl. There is nothing! Too heavy for a Zweijärigen although Mei son is always big and strong. The key word is stability, but since you can also overdo it. I think that with such a product does not have to be equal to the steel pipes. Another minus point: the steering wheel is 360 degree swivel, my son is upset immediately because that thing too difficult. The expensive price is not reasonable, in my opinion!