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@TheArchitect
Now these bikes are to ride up the Belgian bergs, so the starting point really is ‘how slow a gear can we fit?’ And dan decided that 34-28 would be sufficient (more about my choice later). The Sram pg950 fitted the bill nicely. 11-12-13-15-17-19-21-24-28
Paired with a compact chainset that effectively meant that the smallest cassette cog that was compatable with the deraileur would need to be a rather spinny 18 teeth! Aside from the fact that you can’t buy a cassette like that, most of this issue is overcome by never cross-chaining - in fact it already starts sounding upset when in 50-21. The image below suggests that the optimum chainring shift is 50-19 to 34-13
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