Bicycle Mechanics - Recommended brand for a 28T Campy cog.

I'm wanting a slightly larger cog on my cassette. It's currently a 9 speed 13-26. I'm wanting to make it a 13-28.
What brand plated steel cog should I buy? Google shows a lot of Miche brand, is that my only/best option?



Also, Miche brand says: Miche replacement cogs are designed to replace worn Miche cogs or to customize existing Miche cassettes. They are not designed to be interchanged with other brands of cassettes.

Does this mean I need to replace my cassette for a Miche brand, or will it work with my current campy brand parts?

Why not buy a 13-29 Campy cassette? Seems a lot easier. I believe you will need a long cage rear derailler to handle that 29T cog though, and possibly a longer chain (not a Campy guy so don't shoot me if I'm wrong about the RD).

A new cassette runs ~$90, a new cog is ~$7. My current rear derailleur is, if I remember correctly a medium length, from my searching I'm within the specs it requires. If I put a 26T up front I'd be right at the max.

Are the cogs on your current cassette loose? On many cassettes, the larger cogs are all mounted on a spider and cannot be changed individually. If they are individual, then Miche is the only brand that I know of that makes what you need. Mixing cogs from different brands on the same cassette can be done, but shifting might not be quite as smooth and you have to make sure that the spacing between the cogs doesn't change.

Yea, every cog is loose.
If the spacing is different, is that fixed by using a single miche spacer, or replacing all the cogs to match?

I'll go ahead and order the cog, and hopefully it all lines up/fits on the cassette properly.

Check out Marchisio cogs as well. They make individual replacement cogs for shimano and campy. I've got a couple and the quality seems pretty good. As long as the spacer matches the number of speeds, the individual cog width shouldn't matter than much, even between 8s and 10s cogs the difference in thickness is nominally ~0.2mm, which is probably within whatever tolerances they've got when they stamp or machine the cogs anyway. I've got a cassette using a mix of 7s uniglide and 10s hyperglide using 9s spacers and chain and everthing works fine.

What about these: http://www.jensonusa.com/store/product/CS408Z04-Campagnolo+Ultra+Drive+9+Speed+Cog.aspx

Looks like they're campy replacements and you can get a 28t.