The Yakima Raptor is the new extreme to roof top bike carriers. The Raptor's vicious front talon grips your down tube with a fierce approach to ensure your bike goes no where. But do not worry it won't scratch the paint. A high protective padding is in place around the lockdown to ensure maximum effectiveness in tie down with out damaging your baby. We will leave that job for the trail. Fits 1” to 3” diameter downtubes and can be attached to both square and round crossbars. Meaning you do not have to buy a whole new rack system to use this baby.