Today were going to review the RockyMounts Tandem Mount R4 Bike rack part number RKY0512. This rack is designed to allow you to carry a tandem bike up on top of your vehicles roof rack. The rack is covered by a one year limited warranty and it weighs 15 pounds. It will support up to one tandem bike at a weight of 45 pounds. Its designed to work with either Yakama round crossbars or Thule… see more >