Thanks for the inputs. I guess my concern was the location of the seat stay brazeons. Since they're a fair bit lower than the top of the wheel I wasn't sure how to level the rack. Looking at the extender brackets I feel kind of dumb now. I worried that angling the seat stay mounts would really hurt the carrying capacity, but it makes sense that most of the weight will be on the hub (thanks for the physics refresher). Anyway, as I said I'm new to the game so I'll just keep learning as I go. Thanks again.