HSK 2
Xiǎohái qí zhe pínghéngchē zài gōngyuán wán.
The kid is riding a balance bike around the park.
HSK 5
Gāng xué pínghéngchē de shíhou shuāi le hǎojǐ cì.
I fell several times when I first learned to ride the balance scooter.
HSK 6
Wǒ mǎi le yì tái diàndòng pínghéngchē shàngxiàbān yòng.
I bought an electric self-balancing scooter for commuting.