Lastenpolkupyöriä are one of the main categories of children's polkupyöriä. Children's polkupyöriä include four categories: children's polkupyöriä, strollers, baby walkers, and children's tricycles. When buying a polkupyörä, consider the age and height of the child, and choose the appropriate size, that is, a polkupyöräSatulan korkeus 435-635 mm. Kun ostat ajoneuvoa, kiinnitä huomiota käsijarrun kokoon. Jos koko on liian suuri, lapsi ei voi pitää käsijarrua tiukasti jarrutettaessa eikä pysäyttää autoa. Joten on parasta viedä lapsesi kokeilemaan sitä ostoksilla. Lisäksi jarrutusvoiman on oltava vähintään 50 N. Muuten ajoneuvo ei voi pysähtyä ja aiheuttaa vahinkoa lapsille. Lastenpolkupyöriä are also equipped with protective wheels (balance wheels), which can keep the rider in balance, so pay attention to whether they are equipped (one on each side) when purchasing. It is necessary to consider this. The chain cover of children’s polkupyöriä is indispensable. Children’s polkupyöriä with a saddle height equal to or greater than 560mm should be equipped with a chain cover or other protective device to cover the outer surface of the chain and the meshing part of the sprocket. When meshing on the sprocket, the chain cover should extend beyond the outer side of the chain in the diameter direction. If the chain cover is not used but other protective devices are used, the covering range should be extended to the point where the sprocket initially enters the two sides of the chain. Measure at least 25mm along the chain.