ridethecliche

Note: This is my first time putting on a cassette.

So I'm putting my ultegra cassette on my rear wheel and I do it wrong the first time. The spacing looks off on the smaller cogs. Oh I forgot the little black spacers, duh...

Fixed that problem, now there's a silver metal ring, that isn't splined to go on the cassette and I have no idea what it's for but think that it might be important.

What is it? I thought it's the piece that might go on right before the lockring, but it seems that it would get in the way of the chain. Does it possible go between the two smallest cogs?

Thanks for the help!