According to my search results, some bike brands that are made in China include YOELEO, Triaero, Miracle, Tideace, Shimano, RockBros, Tianjin, Orbea, and Kestrel. Diamondback bikes are also manufactured in China by the Taiwanese company Kinesis Industries.
Most large bike companies have their bikes made in Asia, more specifically in China and in Taiwan.
Trek is one of the largest brands of bikes that sold their products to hundreds of dealers in the United States and has their first bikes manufactured in the US. The company has now moved itsits manufacturing plant to China and Taiwan for their entry and mid-level bikes.
Another bike brand that has their bikes manufactured in China is Specialized. Although, they only have their cheaper bikes made in China.
Orbea has their high-end carbon frames for their bikes made and manufactured in China which is then assembled in Spain.