I've had two road frames and forks set up by the manufacturer with SFNs in carbon steerers (a Boardman and a Cannondale Six13).
I want to put one in my current fork - a Kinesis - because the expander bung i'm using at the moment (made by Profile) works loose when i really give it some in a sprint. I have no confidence in it whatsoever.
Is it really *that* bad an idea to put an SFN in a carbon steerer? If it is, can anyone recommend a truly reliable expander bung?
Thanks.

