ROCKBROS is an original brand founded by cycling enthusiasts. The goal of ROCKBROS is to offer high - quality products at an affordable price to every customer who loves cycling and outdoor sports. The speed should be less than 120 km/h. Check it every 4 hours during use. If it is installed on the car roof, please do not open the sunroof. The cylinder rod should face the rear of the car. Otherwise, air or water may enter during driving. Please check before each use whether the screws are tightened. ROCKBROS Roof Bike Rack for Car with Suction Cups - Bicycle Storage Technical Data: Brand: ROCKBROS Series: XP100 Colors: Black/Red/Green/Blue Material: Aluminium + Rubber Capacity: For 1 bicycle / 2 bicycles / 3 bicycles Features: Easy Installation: Installation only takes 10 minutes, making it very convenient for cycling trips. Rubber Suction Cups: The roof rack connects to the car through suction cups, which will not damage your car. Universal Compatibility: Suitable for most cars. Lightweight: The roof rack is very lightweight. You can easily carry it. 4 Colors There are 4 colors available: Black, Red, Green, and Blue. You can choose the color that suits your car. You can also select different sizes: for 1 bicycle / 2 bicycles / 3 bicycles. With Suction Cups The suction cups will not damage your car. Press the suction cups to expel the air. Press on the cylinder rod until you can no longer see the white line. Dust - proof Cover This ROCKBROS luggage rack is very easy to install and store. When not in use, you can simply disassemble it. The dust - proof cover protects the suction cups. Adapter The roof rack is delivered with a quick - release lever. If you need an adapter, please purchase it separately. Adapter sizes: 15mm100mm, 15mm110mm, 20mm100mm, 20mm110mm, and 12mm*110mm. Installation: Clean the car and the suction cups with a clean and soft cloth. Press on the cylinder rod until you can no longer see the white line. Attach the fork. Confirm the rear wheel. Secure the rear wheel and pedal with straps.