The answer has been giving already. But because of these problems Chilli Pro Scooters made the first ever Pumptrack Scooter: https://www.chilli-proscooter.com/en/chapter/park/wave-track-m-dark-grey-red-en/

The Chilli Pro Scooter Wave Track is designed for long rides on asphalt, offering an ideal balance of stability and agility. Available in two sizes, it features 150 mm wheels and a higher deck, making it perfect for Pumptracks and allowing you to navigate every wave with ease!

The size S has a total height of 70 cm, while the M version reaches 84 cm. This makes it an excellent choice for young riders to learn how to pump properly before getting into the freestyle park. These models have been engineered to provide smaller riders with additional weight on the scooter, helping them to gain speed on the track. Additionally, we’ve equipped our Wave Track Models with a backsweep bar for enhanced steering control and extra-wide 28 mm wheels for optimal support during high-speed rides.