The Trek rear rack that came with my '06 520 is a piece of junk. I put it on a 1974 Schwinn Le Tour that I bought to go grocery shopping with. I had to unscrew the extenders about 3 or so inches in order for it to fit. The one on the left side is now bent. I had some navarro around town panniers on the rack that were about half full with groceries. Nothing too heavy though. What junk. I guess I'll be calling up the touring store for my tubus racks.