Originally Posted by
Squeezebox
For me, I don't need an 11 or 12 tooth cog. So I would be okay with 9 speed, I think,
The sprocket count (8/9/10/11 speed) is a totally different issue to the sprocket size or range.
As sprocket count increases, sprockets get thinner and closer together. Chains need to be thinner. On some chains, just the central roller is reduced. On others, the thickness of the sideplate is reduced.
Hi sprocket count systems are designed for high-end groupsets with high-end metallurgy. The danger of weakness becomes more significant as you reduce the price and quality.