Rockbros suction cup bike rack is a perfect way to carry your bikes during road trips and camping excursions. Single heavy-duty fork clamp to securely hold your bicycle by the front fork. Adjustable mounting clamps make it easy to install and switch between multiple compatible vehicles. Artistic design, stylish rack lighten cycling sports and fit your bicycle. Let you enjoy the trip more conveniently. Installations: clean up the car roof and sucker to ensure no water, sand, and dust install the sucker on the rooftop. In particular, press the sucker hard press the sucker with great strength and press the cylinder rod till you can't see the white line usually 30-45 seconds fix the fork with quick release on the front sucker step confirm the rear wheel position and fix the rear wheel and pedal attention before use: advise the speed less than 120 km h please check the cylinder rod white line before using if installed on the car with a sunroof , please don't open the skyline when not in use for a long time, please take it down and put it away to prolong service life. The maintenance lube is not included in the package, because it is an embargoed item in international transportation. You can find a special silicone oil at your local shop to replace the maintenance lube. Please note that the front roof rack should be installed in a flat place like the car roof . If installed on the front windshield which the curvature is too large, the strong suction of suction cup will crack th...