In fact, one of the great advantages of the compression rack is that the manufacturer saves trouble very much. In the past, the diamond rack may be forty or fifty, and a number should be given every 1CM difference. Generally, as long as it is a compression rack of S, M, L M, L, it is a big deal to get another XS, XL, and then the user can adjust the fit by the seat tube, which saves the manufacturer a lot of trouble.