SmartRack roof rack, Thule The Thule SmartRack XT is made of high-quality steel and is covered with a black plastic jacket. It is characterized by top quality and perfect processing. Thule SmartRack XT is a stable base for securely attaching a bike rack, roof box, ski rack and other accessories to the roof of your vehicle. Crossbar profile: 32 x 23 mm Bar material: Steel Maximum recommended speed: 130 km/h Certification: TÜV/GS/Thule Test Center™ Manufacturer: Thule, Sweden