The most difficult part is getting the wheel off and the original chain. My friend Donny had to use a dremell on one of the links since it doesn't have a master. The cush drive is easy to put in. I had close to 25k when we replaced the chain and cush drive and also a rear brake rotor. I think you were asking about the different size sprocket in a different thread. I believe we went with a 19 tooth because it was kind of like having an overdrive since I do a lot of highway miles. If you want to be quicker off the line, then the 17 tooth is the way to go. I think that is what is standard on the SM. Have fun.
