Indoor bungee jumping is a high-intensity sport, which requires the use of high-quality bungee jumping equipment to ensure sports safety. Steel pipe is one of the most important parts of bungee jumping equipment, and its diameter directly affects the load-bearing and stability of the equipment. The diameter of the steel pipe for indoor bungee jumping should be about 3-4 cm, which can ensure that the steel pipe has sufficient strength and stability, and at the same time, it will not affect the sports experience too much. The specific steel pipe diameter should be determined according to the model, design and manufacturing standards of bungee jumping equipment, and it is best to consult professional bungee jumping equipment manufacturers or sports coaches.