This Thule Double Track Pro XT bike rack is a great in-between platform rack for two bikes based on cost. It is heavy duty and sturdy, with well built plastic cups for both front and rear wheels with straps to hold the wheels extra securely. The instructions are not always clear, but the company provides good customer service and helpful videos. The hitch bolt is 19mm and the locking arms are not included, but the wheel trays are secure and the wheel trays can be adjusted to fit narrow road frames.