Today we are going to show you part number TH593 from Thule. This is their wheel on accessory. This mounts to any Thule roof rack system and also a few different Yakima systems also. When this type of rack requires you take off the front wheel of the bicycle, you use this part number here, the TH593, to store the wheel so you do not have to keep it inside the vehicle and take up any extra room… see more >