Yay or Nay?

bit of helicopter tape where you get heel rub or chain bounce – yes.

big neoprene sock – no.

Both:

PU tape (aka helitape).
Then use a thicker protector such as neoprene or innertube.

Tube/neoprene will protect properly against chain slap. PU tape will protect the carbon fibre against abrasion of dirt that will get trapped.

edit: missed the road bike bit…just PU tape is fine on a road bike normally but I would probably double it up on top as thicker will work a lot better.

do you get chainslap on a road bike?

this guy does:

[video]http://www.youtube.com/watch?v=5z1fSpZNXhU[/video]

No, not necessary.

Well, I spotted some grease on there, and although it could have come from anywhere in the interest of preserving carbon loveliness I’ve stuck a bit of helitape on.

Won’t happen in the big ring – sort your gearing out 😉