Who doesn't need it, take it and use it; Oh, yes, because the idle bike is too slow, the rear brake line has been hinged, so' rush' it; Besides, cycling is a kind of exercise, and "comfort" can't achieve the purpose of "exercise" well, so the fastening screws and tie rods under the "seat" have been removed, and the "seat" just floats on the seat post, so don't poke your eyes when riding fast, which will cause discomfort.