Originally Posted by DMF
No, you're simply asserting a fact without supporting it.
I explained how I read the chart. You have not explained how I'm wrong, only that I'm wrong.
I will point again to the case of the ST-6510 (in the little box) and the FD-6500 (in the big box). Those two *are* compatible; the shifter is bundled by Shimano with both single and double kits. Compatibility thus crosses inner box boundaries. Do you not agree?
And if it crosses inner box boundaries, then all parts in the two large boxes (ST and FD) interoperate (to one degree or another). Do you not agree? If not why not?
The lines show the compatibility, the blue line is an example of this. The size of the box is irrelevant.
For the past 8 years I've ridden a bike with ST 7700 shifters. They cannot shift a triple. Give it up.