You'll definitely need a new front derailleur when switching from a double to a triple. A double front derailleur doesn't have the right range of motion to get from the inner ring to the outer ring on a triple. To tell the truth, the only changes you need on your bike to switch are to replace the left side shifter, a front derailleur and possibly a rear derailleur if your current one doesn't have enough capacity.

Sorry, I don't have a spare front derailleur since I'm still using it. Luckily if you end up picking one up on ebay or even retail they aren't really expensive, about 20-40 for ultegra components.

Hi, still interested in the parts?

I'll probably finish the upgrade by the end of next week. Just need to get a 10 speed chain and then I'll put the pieces on. I figure around 10 bucks for the derailleur or just buy me a beer at the next chainlink bar night or after a CM

Yeah, I'm not planning on using them after my upgrade and I'd rather someone use it than having them sit in the closet.

i will be at critical mass this friday (at least i'm planning on it) but i probably wont have my geared bike with me. what bike (make/model) do you have? i can start some research on my end. i'm not a professional mechanic but i put together both of my current bikes myself for the most part, so i'll see what i can figure out. feel free to email me back at ynwchen@gmail.com