The Kettcar by Kettler is a very high quality and stable processed GoKart. The pneumatic tires is really quiet as a whisper. The seat, which has been described in other reviews rather than problematic functioning properly and can the respective size of the driver to be adjusted easily. The seat will not budge and it wobbles nothing. The steering can be operated very easily, my 5-year-old son loves to ride with one hand and it can steer properly. The brake is very stable and works great. Switching from Tretgang and backlash works very well. Results: Easy quality of Kettler. A clear buy recommendation.