Yeah, they aren't bad... and I've gotten quite a few little items there from time to time. I usually get my oil from them when I'm over that way. But I'll not make a special trip. They are by a HF so I try to time my Cycle Gear stops when I need some crappy chinese tools from time to time.
One thing that I did notice, is that they definately don't cater to the Dual Sport crowd. Mild dirt bike stuff, and mostly street bikes. But like you said, the best time to hit them up is on their clearance days.
They do catalog ordering as well, like everywhere else. I ordered something from them on "Clearance Day" out of a catalog and got it for a great price. Keep that in mind if you want to do the 18" wheel yourself. You can buy the Excell rings from them, but knowing the part number or cross reference bike is the key. Because they certainly won't know what you are talking about.