The detachable is effectively the same rack as the Classic in dimensions and function. The defining difference is that the “Vs” (the ends) slide out with the simple removal of a tool-less pin. The bar remains on the car. This option is for the sales person driving 1000 miles per week and wants to save on gas. It is for the urban dweller that must slide into a parking garage, or the garage in the back yard. It is for the paddler whose spouse does not appreciate fully the beauty of my design. Another underutilized benefit is the ability to buy multiple bars, and place them on multiple cars. This way, you can slide the Vs into whichever vehicle is easiest to get out. The down side is that the ends are a little cantankerous to store, and can be a little tricky to slide in sometimes (especially if you don’t keep them lubed). I use a Classic for my everyday rack, and keep two detachable bars on the roof for add ons.