I'm digging this old thread up now that I'm actually getting around to installing my threadless carbon Kestrel fork. Along with it will go a new stem and bearings; and yes, I have the shim for this to work properly. But as I got everything together and realized the tape and brake levers will need to come off to get the old skool stem off, I realized now would be the time to upgrade to STI brake lever shifters and from 7 to 8 speed.

I'm thinking since I spend most of my time on the hoods, ST-2300 would be fine for my needs - yes, no, maybe??? But has ST-2400 replaced 2300? Will my existing 105 der' make the jump from 7 to 8 without a problem?

Feel free to provide any countering thoughts, but I'm not really willing to invest in a 9-10-11 speed. I'd probably just go buy another bike if I wanted to make that leap.