UNIVERSAL RACK :This suction cup bike rack fits most vehicles—including sedans, coupes, hatchbacks, SUVs, and vans—and works best with flat roof surfaces; it is not suitable for vehicles with excessively smooth roofs (which reduce suction adhesion) or highly sloped side roof areas (which affect stability), making it perfect for safely transporting bikes during road trips or camping. STURDY AND SECURE : The aluminum alloy body is sturdy enough to hold your bike. Rubber sucker protect your car paint from scratches. Comes with the velcro strap for fixing the crank to avoid it scratch your vehicle. TOOl-FREE INSTALLATION AND REDUCED NOISE:The suction cup bike rack requires no complex tools for installation.Follow the included instructions for installation. Meanwhile, its compact and slender shape effectively controls wind resistance, greatly reducing noise during driving and allowing you to hit the road with peace of mind. COMPATIBILITY : Fit for mountain bikes, road bikes,trail bike or any bike with a quick release front wheel. Two radians on the rear wheel sucker perfectly adapted to mountain and road bikes. This bike carrier for car make travelling with your bikes come true. Any using problem please let us know, we will help you to figure out. suction cup roof bike roof rack bike carrier rooftop bicycle roof mount bike rack Quick Release Aluminium Fit Bike Fork:
If your fork is 15mm or 20mm QR front axle, you need to buy 15mm or 20mm adapters for mounting on the sucker bike rack,we have five specifications adapters :
9mm adapter 100,ASIN:B07QRRXKPS
12mm adapter 100,ASIN:B07QLLRX4M
15mm adapter 110,ASIN:B07D4G8QLG
20mm adapter 100,ASIN:B079DPTMPG
15mm adapter 100,ASIN:B079DNV8QV

Brand :ROCKBROS

Product : Car Roof Rack
Material :Aluminum alloy
Weight :1-Bike:2.1kg size:16.9*5.12 in(Length*Height)

2-Bikes: 3.4kg size:32.3*5.12 in(Lenghth*Height)

3-Bikes: 4.5kg size:36.2*5.12 in(Lenghth*Height)
Color :Black
Package include : Aluminium Alloy Bike Rack , Rear Wheel Sucker , Fixed Velcro for Crank

Note: You can find a normal silicone oil at your local shop to maintenance the suction bike rack.
Installations:
Step 1: Clean up the car roof and sucker to ensure no water, sand and dust
Step 2: Install the sucker on the rooftop
Step 3: Press clinder rod till you can't see the white line ( usually 30-45 seconds )
Step 4: Fix the fork with quick release on the front sucker
Step 5: Confirm the rear wheel position
Step 6: Fix rear wheel and pedal

Note:

1.If installed on the car with a sunroof , please don't open the skyline
2.The speed of the car must not exceed 120KM/H.
3.Wipe the installation location before installation to ensure no dust and keep it moist.
4.Check the vacuum button for bulging every 4 hours when using it for a long time.