Originally Posted by
thook
No, man....that wasn't the answer I was thinking of. It has to do with brifters being road spaced and your use of three rings on an mtb crank. According to the post, the third/outer ring is problematic, if at all doable, while the inner and middle rings are good to go. It has to do with the center to center spacing of a road crank vs mtb crank chainrings.
I think you're missing this part from the second or third post:
Originally Posted by first page
Shimano front der cable pull ratios are different between road and mountain bike, but you know that. Not sure how far back in time this difference is valid. Also i believe that the cranks have slightly different ring C-C spacings, road and MtB.
So there are two factors, apparently. I want to know if this pull ratio thing is true.
So the question for me is whether finding a triple road crankset would work while still leaving the brand new deore FD on there. I need top pull functionality-- it's a folder.
Anyhow, I went back out to the garage this AM in my bathrobe to try and fine tune things. It works. The rings are very close and will likely rub when flexing under real power, but I got it running pretty reasonably as is-- with mountain cranks, FD, and Sora STI "brifters." I should take a video!