Originally Posted by
Ghrumpy
At the risk of being too obvious, add the previous twenty years' worth of derailleurs. Many of those are still in service.
For a long time, Shimano provided annual updates to their printed dealer service manual. Shouldn't be too hard to come up with the specs. I have most of them myself with only a few gaps.
Shimano's 'specification handbook' PDFs only appear to extend to 2005. Schematic breakdowns mostly just confirm a derailleur existed; they don't, unfortunately, tell me the numbers to fill in the table. The ADFC link is the most useful so far.
I've arbitrary excluded derailleurs below 8 speeds or that won't fit standard hangers, both because the information is hard to find and I couldn't think of many circumstances where someone would care. Are people pairing 6-speed derailleurs with new cassettes and shifters?