In addition to the invoice (or sales receipt) issued by the store or factory direct sales, at the same time, the frame number is printed (or handwritten) on the ticket (engraved on the bottom bracket - which is the bottom bracket) At the bottom, you can see a series of numbers after turning the car over). Only by combining the two numbers into one can you judge whether it is genuine. Because Phoenix Flying Pigeon itself is a mountain bike that is always priced below RMB 1,000. Its technology is very common, such as an aluminum alloy single-tube frame, which can be produced by small bicycle parts factories. It is easy to copy (even Giant’s entry-level ATX 7xx ALUXX The double-tube technology aluminum frame can now be copied by ordinary factories, let alone Phoenix's). In addition, Phoenix is ??now a franchise manufacturer. Many factories in Henan, Shandong, Tianjin, Jiangsu, Anhui and other places can print the Phoenix trademark on the packaging and frame by paying a license fee of dozens of yuan per unit. Therefore, it is difficult to distinguish between good and bad, unlike Giant and Merida's cars (which are all manufactured in-house, and the frame steel code of each unit is recorded at the factory).