From what I can tell the standard width is around the 53" mark. The EX models are quite a bit wider and wider gives you a better ride. My z6 non EX isn't bad. I don't feel like it's going to tip over as long as I don't do something very stupid. The 550 has CV-Tech clutches in it. They are well made and you shouldn't see many problems with them. Changing the belt should go quick after you have done it once or twice. Belts are not a high cost item and should last a long time between changes. I did price parts for cfmoto before I bought mine. The prices pretty good compared to other brands I have owned over the years. You will have to price out parts like brake pads, starters,cv axles, wheel bearings ect. where you live. What parts you keep on hand depends on how many machines you are running and how long it will take to get them in should you need them. If you get to the point of deciding what you need to keep on hand, I'm sure a list can be made. If you are concerned with doing repairs yourself, I would find a shop that will treat you fair and just bring them in.