What's the difference between a bicycle shaped tube and a round tube? Do you see that the frame is round or round? See the frame is flat, it is shaped tube? Which is good?
It's not round, it's all shaped tubes.City running doesn't care if it's shaped, you don't know how big it is to ride.
One is round, one is gem shaped, and the other is shaped tube.As the equipment improves technically, it can now be made of bamboo tubes, fish head pipes and so on
Round tubes, square tubes, elliptical tubes, all of which are not shapedAbnormal shape is irregular shape, such as: one is water drop, and the other is square
