Originally Posted by
Ironfish653
In my experience, the foam pads on the TT hooks start getting gummy and leaving black stuff on your paint, especially if it's a light colored bike.
Of course, the bike that's got the worst case of that spent almost 3,000 miles on there this summer.
A few friends have those style racks and there is no paint left on the top tube where it hooks over. Rubbing/Vibration/Bouncing down the road causes it to happen.
Maybe it's just me, but I would never buy a bike rack that uses the frame as a clamp point.