Eighth Inch and All City are the same cogs, but the Eighth Inch has the black coating on it. I think Alien also uses the same cogs, as many other companies probably do. I run an Eighth Inch and I like it, but the black coating doesn't really do anything because it wears off fairly quickly where the chain contacts the teeth.
Originally Posted by whitey4521
i currently have a 46t crank and a 15t cog, origin 8 crank and not sure what my cog is but im thinking about switching to a 16t cog...does that change my gear ratio much? sorry im a newb
What kind of terrain do you run in? Do you use your bike as a commuter or for longer rides?