I got a rack last night, and mounted it to my CX/commuter bike. It's an older model of Planet Bike's KOKO rack, which has lots of mounting points for panniers. I'm well on my way to Fredmobile status.
I noticed the 55 lb max capacity, and hesitated for a minute (how will I carry room-sized aquariums and wrought-iron lawn furniture??), then stopped to think - that's a lot of weight. How much do you actually carry on your commutes, and on other rides? What are your heaviest bring-alongs? That will help me put this number in context, and figure out if I got bamboozled.
Already, I can tell this is a much more convenient way to carry a book. Too bad I waited until it's getting too cold to want to sit on a bench at the park and enjoy one.
Do panniers need to lay flush against a rack? My cassette and RD stick out a bit on the drive side, and the disc brakes stick out a bit on the other side. Seattle's rainy season isn't that far off, and I think the smartest thing would be for me to start bringing a dry set of clothes to work every day.
Finally, should I be worried if the bottom of the rack doesn't attach to the eyelets or the skewer or any of that, but instead clamps to the rear triangle ... similar to how brifters attach to handlebars? The clamps are coated in rubber, so they're grippy, and don't scratch the paint - but is there any reason to think this will let go under load and that the rack might go into the rear wheel? I'm guessing it's fine, but what do I know?