ROCKBROS อุปกรณ์ขาตั้งติดหลังคารถจักรยาน

tip: 1. Sucker Roof-top quick release is 9mm quick release adapter. If your bike need 15mm or 20mm adapter to install it , you can contact us get it buy free. (Such as your bike fork barrel axis size is 15*100mm, or 15*110mm, 20*110mm). leave us a message to get one pair adapter . 2.Please make sure that the top of your car is flat and not particularly curved. 3.You can watch this YouTube video with an introduction.copy this link and search. https://youtu.be/ogEOwnkvDbk Product detail: Brand： ROCKBROS No. of Bikes：1/2/3 Color：Green, Blue, Black, Red Weight：one-bike about 2kg, two-bike about 3.5kg, three-bike about 4.6kg Feature: Simple installation Lightweight Without any harm to the car Applicable to any car Low wind noise ​Installation steps: Clean up car and sucker Press cylinder rod until you can't see the white part Fixed the fork Confirm the rear wheel position Fixed rear wheel and pedal ​If you don't know how to install, please go to see item video by computer. Tips: if it is installed on a car sunroof, please don't open the skylight. Speed less than 120km/h Check car roof rack every 4 hours. Our text data: three bike mode, carry total 60 kg three bikes, large wind(62-74km/h), car speed (100 kg/h), no any problem.