2 frame brackets. Max. Wheelbase: 120 cm. Wheel size: 22-29 inches. Max. Tyre width: 66 mm. Max. Load capacity: 60 kg (30 kg per rail). Distance between bicycles of 19 cm. Material: SteelFoldable: Yes. TÜV-tested by TÜV-Süd (certification number: Z1A 082470 0011) Frame diameter: min diameter 30 mm - max diameter 50 mm (round)/min 30 x 60 mm - max 50 x 70 mm (oval)