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As you may have found, some sources say the 6700 SS cage (mid I suppose, but there's no short) can take 28t, some 30t. Possibly as there was no 30t when it came out?
Anyway I have a 30t and I'm pretty sure I could fit a 32t as it's not close to fouling. But my frame seems to have a particularly long dropout which helps.
Oh and I have a 50/34 chainset which puts the total teeth difference 1 over the stated capacity. It's fine.
Ultegra 6700 Rear Mechs:
To run a 30T biggest on the rear do I need a medium cage or the long cage?