Alright. I'm saving up to get a Windsor 8 speed IGH and I have a few upgrades in mind. One that I'd really like is a fully closed up chain case, like this one:
However, I'm not sure where to purchase them, and how to tell it'll work right. From what I've read, the number of teeth per cog is a consideration. Is length between the two parts it encloses also something that needs to be measured? Also, are there any metal ones floating around, or is it all plastic these days (or is plastic -the- way to go)?