I ordered the seat because I have an E-Bike and assembly is possible only through the racks. And it fits perfectly! My daughter (4) is not interested in myself cycling and therefore I thought for the little money is it worth it to me! Super happy !!! Oh yes - I got the seat itself mounted - even the wife! ;-) Simple assembly - only for mounting the rack I have 2 washers and nuts like something almost everyone has at home.