Originally Posted by
Chris_W
That is terrible news. I just checked the Shimano website, and you are correct. There are already not enough high-end road triple cranksets available, and now this one uses a stupidly-sized inner chainring. This is very frustrating. If anyone is in the market for a triple crankset, then I do not recommend the new Ultegra for this reason.
Geez, getting away from the original post, aren't we?
Anyway, the inner chainring on the 6703 crankset is indeed 92mm BCD. The setup is the same as the Dura-Ace, where the inner chainring bolts to a special middle chainring, which then bolts to the spider. This leads me to believe that you could replace the middle Ultegra ring with a TA tripleizer, which means you
can put on a 74mm BCD granny. It's kind of a kludge, but it should work.
Exploded diagram:
http://techdocs.shimano.com/media/te...9830676705.pdf