I was hoping that someone could provide me with the precise Shimano road-bike 8, 9, and 10 speed sizes for the following:
- Cassette Spacer Width
- Cog/Tooth Width
- Maximum Chain Width
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I think these may be what you're looking for. FYI, a lot of this information is available with a little searching. Depending on what exactly you are looking for, you might want to look up a document for a specific cassette as the numbers might be slightly different.
Spacer widths (From Shimano tech docs)
Cog/Tooth Width (From Sheldon Brown)
Chain widths (From wikipedia)*
*These chain widths are the standard widths, which I assume are recommended. I wouldn't go wider, but a narrower chain will probably work as some chains are cross-compatible.