x2 via a hitch insert rack which will carry two bikes. Get a Class III hitch if you plan or may use it for other things and they can handle more bikes if the rack will accomodate them. You'll get less wind drag at the back and its much easier for you to remove then up top. Beside the Compass does not come with the Cross rails and another bike carrier is needed in addition which become as expensive as using a hitch method.