What the warnings say
On March 19, 2026, CPSC published product safety warning 26-337 for Ridstar Q20 and Q20 Pro e-bikes. The hazard is that the batteries and wires can ignite. CPSC reports 11 fires, including one burn injury, five reports of smoke inhalation, and two reports of property damage totaling over $40,000. The consumer action is to remove the battery immediately and dispose of it through a local hazardous-waste process. Do not sell or give the batteries away.
On June 25, 2026, CPSC published product safety warning 26-584 for Ridstar Q20 and Q20 Lite e-bikes. The front wheel can detach without warning. CPSC reports 32 detachment reports, including 31 injury reports such as concussions, broken bones, cuts, scrapes, and bruises. The consumer action is to stop using the e-bikes immediately and dispose of them. Do not sell or give them away. The June notice also says the Q20 batteries from the earlier warning must still go through hazardous-waste disposal.

How CPSC says to identify them
Both notices describe black e-bikes with the brand name Ridstar printed on the battery. The model number is on the purchase receipt: Q20 or Q20 Pro for the March warning, and Q20 or Q20 Lite for the June warning. The March notice lists sales on Amazon.com, Ridstar.net, and Walmart.com. The June notice adds AliExpress.us.
The March notice says Huizhou Xingqishi Sporting Goods Co., Ltd., of China, refused to agree to an acceptable recall, and that the company objects to the press release. The June notice says that company has been unresponsive to requests for information or a recall. CPSC also says not to throw the lithium-ion battery in the trash, curbside recycling, or store battery-recycling boxes, and to ask a household hazardous-waste center before taking a defective pack there.

YVY uses Ridstar's name on its own pages
YVY's K20 product page says "Ridstar is proud to offer" shipping and tells buyers to email service@ridstar.com. The same page says the Ridstar warranty policy is only for orders from ridstar.com. YVY's own warranty page, checked the same day, names Yaozhuo International Trading Limited in Hong Kong and describes a one-year YVY parts warranty. Those are YVY's words. They are not a CPSC finding that the K20 is a warned Q20.
CPSC's two warnings do not name YVY, the K20, the K20 Lite, or the K20 Pro. This page does not expand the warning to models CPSC did not name, and it does not clear them either. The YVY guide is separate.

