Does the subject want to ask "how many holes should be changed for Xidesheng ad350 flower drum"? Two holes. According to Xidesheng official website, the flower drum is used to install pedals. You can check both sides of the central axis of the flower drum to see if there are two threaded holes, which are where the pedals are installed. Founded in 1995, Shenzhen Xidesheng Bicycle Co., Ltd. has become an industry leader, a bicycle high-tech enterprise integrating R&D, production, sales and service, and one of the largest bicycle manufacturers in China. The factory covers an area of 450 mu, with an annual production capacity of over 6,543,800+million vehicles, and its products have won the title of "China Famous Brand". XDS trademark was awarded as "China Famous Trademark" and "Guangdong Famous Trademark", and the company won honorary titles such as "Guangdong Excellent Private Enterprise", "Shenzhen High-tech Enterprise" and "Shenzhen Private Leading Enterprise".