Originally Posted by
Killian
I recently did this with the 5700 double. The spacing is the same, just adjust your high and low limit screws so that you can't push the shifter past the small ring. I had to lower my front derailleur a little to get good shifting. You may need to switch bottom brackets as well. I thing the triple use a 118 BB and the double uses something closer to 108.
Since this is a duplicate posting you might try posting your comments on the other version.
I have two comments on this. First, it's necessary to use the two outer shifting positions to protect the internals of the brifter from an inadvertant shift to a locked out outer position. This is described in the other posting. Second, the 5700 cranks are Hollowtech II and have the bottom bracket spindle built in so you can't change the spacing.