Are Xidesheng and Rex mixed brands?

Neither of these two bicycles is a miscellaneous brand.

Shenzhen Xidesheng Bicycle Co., Ltd. was established in 1995 with the registered trademark XDS. It is one of the largest bicycle manufacturers in China, with an annual output of over 5 million vehicles and a powerful bicycle manufacturing factory. For many years, it has produced high-end carbon fiber bicycles for international brands, which enjoys a high reputation at home and abroad.

Rex Bicycle is a world-famous bicycle brand founded by 1887 in Britain. It is the largest bicycle manufacturer in Britain and enjoys a high reputation and wide popularity in the bicycle industry.