Features: 
Quick-release wheel straps for convenient loading and unloading of bikes, and adjustable for different wheel sizes up to 2.5 inches.
Fits bike frames up to 100mm (oval 80x100mm, round 22-80mm)
The only roof mounted bike carrier on the market with a capacity to carry bikes up to 20 kg.  Wheel holders with rubber pads for protecting the rims of mountain bikes and help secure the wheels of road bikes. Universal Quick-attachment allows mounting on various roof bars, up to 60 mm width.
One Key System compatible – with this accessory you can replace the locking cylinders to use one and the same key for all your Thule products.
T-track adapters (20x20mm) are included for mounting on Thule WingBar Edge, Thule WingBar, Thule SlideBar, and Thule AeroBar.
Fulfills the City Crash norm.