Originally posted by cyclezealot
My is a Thule system with a claw that clamps down on the down tube to secure the bike..
I like the system yet the swaying bothers me.
Yes, there are two types of roof racks: fork mounted and upright.
I have a Thule fork mounted, and I do believe that it is much more stable than any other upright bike rack. Like you said, I see bikes sway on some other cars, but they're all upright bike racks.
When it comes down to it, and you decide on a roof rack, I'd recommend a fork mounted type.