Our most cost effective solution for truck bed bike racks. TDR or "Tie Down Racks" will work with mountain, BMX, road, and Ebikes. Whatever your favorite bicycle, this rack will work with it. The TDR rack has the ability to work with bikes having longer fenders making it a bit unique to the QR3 racks. Mix and match TDR and QR3 as you like. They all use the same Cross Bar making it very modular and upgradeable.