I used the standard alloy 979 for racing for the latter half of the eighties,they suited me fine,being 65 KG at the time,but I did change the frames more or less yearly just as a precaution.But I was always put off buying a carbon one,mainly by the stories of how many Sean Kelly used to go through a season
I read somewhere that the problems caused by the carbon fiber main tubes being so stiff, all the frame flex gets concentrated at the joints, causing premature structural fatigue.Not sure if they just start to 'unbond' or actually crack.
That's the sort of thing I was thinking about. Mr K rode one to many wins - but was it just the one?! Highly probably not! I know where there is a very nice NOS one and I've been sorely tempted as I really like my 979 bike - and I could hopefully trust it hasn't been 'abused'.
To answer the question, yes, I believe they are a carbon wrapped aluminium tube (but if I'm wrong - somebody pleae tell me!)
Today is the yesterday of tomorrow.