Question 1

Will this work on a Tesla Model S with a glass roof?

Accepted Answer

Yes! Absolutely! The beauty of this product design is the damage-free, low profile application. 
2 Reminders: 1. Follow the manufacturer's recommendation to wipe the suction surface with a damp towel before application of suction cups. Any wax or silicone  could interfere with strong adhesion. ( I have traveled several hundred miles on the interstate hwy. at speeds up to 75 mph. with no loosening or vibration - It's convenient to view the bikes through the glass roof!) 
2. Be sure to remove all pieces before running your vehicle through an automated wash! I forgot once, and ended up having to replace my rack.

NOTE: My schedule was super busy last summer, and I kept putting of removing the suction mounts for about 2 mos. I was concerned that my deep shine red paint job would be dulled or worse. Nope. I was relieved that after allowing the device to stay adhered to my roof - through a couple of rain showers - no dulling or damage at all. 
This product is a great buy, and as I've stated before, a high- end vehicle needs a high end product to protect your investment. This is it.
 Yay, Rock Bros.!!!

Question 2

How do you measure to see if you need the adapter to miunt your fork? i got one mtb full susp & a giant gravel bike. both disc brake bikes

Accepted Answer

Adapters headline: ROCKBROS Suction Cup Bike Rack Adapter 9/12/15/20mm Diameter 100/110mm Axle Length for Car Roof Top Sucker Bike Rack 
Asin: B08VNQNF91
Asin: B08VNFRVZS
You can search the headline or the Asin on Amazon or find adapters links in the description. There are 5 types for you to choose from.

Question 3

Will the front axle mount work with my gravel bike, specialized crux or will an adapter be needed ? what about an mtb with a rockshox fork?

Accepted Answer

Asin: B08VNQNF91 for Adapter 9/12/15/20mm Diameter 100/110mm Axle Length for Car Roof Top Sucker Bike Rack.
You can search for ASIN or find adapters link in the description. There are 5 types adapters for you to choose from.

Question 4

Will it work with a thicker axle like on heavy bmx bikes?

Accepted Answer

Yes it should work. As long as the forks fit in to the front locking axle your good to go.

ASIN	B07PPNVHT4
Automotive Fit Type	Universal Fit
Best Sellers Rank	#75,887 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #134 in Bicycle Car Racks #589 in Cargo Management Products
Brand Name	ROCKBROS
Color	red
Compatible with Vehicle Type	Hatchback, Passenger Car, Sedan
Customer Reviews	4.2 4.2 out of 5 stars (369)
Included Components	front suction cup rack,1*rear suction cup,1 crank fixing band
Is Foldable	No
Item Dimensions	18.5 x 5.91 x 5.51 inches
Item Weight	2.1 Kilograms
Load Capacity	44.1 Pounds
Manufacturer	ROCK BROS
Manufacturer Part Number	XP1001RD/1
Material Type	Aluminum alloy
Model Number	XP1001RD/1
Mounting Type	Suction Cup

ROCKBROS Sucker Bike Rack Quick Release Aluminium Alloy for 1 Bike

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