There should be no problem running either a SS or 9 speed chain on the setup you describe. SS chains come in either 3/32" or 1/8". If you want to use your LX derailleurs your chain will have to be 3/32" (that's also the size of a 9 speed chain). As far as the difference between chainrings, multi-speed chainrings are designed with ramps and pins to help the chain pick-up and derail the chain. Since a SS dirvetrain does none of that, there are no pins or ramps on SS specific chainring. It's also a good idea to keep your derailleurs. The spring action of your rear derailleur is superior to the WM tensioner and will make up for any chainline issues; the front derailleur will also keep the chain on the chainring. I am not a big fan of spring tensioners, as I have seen them consistantly fail. If or when you decide to use the tensioner, I suggest you remove the spring and ziptie it in the "push up" position (see below). So, welcome to SS club and I hope you find riding sans derailleur as much as a hoot as all the other fools like me.rob.char said: