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PostPosted: Thu Jul 01, 2010 1:33 pm 
North Wales AEC / OWMTBC 2010 Champion
North Wales AEC / OWMTBC 2010 Champion
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Joined: Sun May 11, 2008 10:13 pm
Posts: 6066
Location: Chester
Good idea with the epoxy.

The previous owner said he believed that the downtube/BB had come unstuck, but to me the only suspect one is the TT.

I cannot see any play or movement whatsoever. The slight whitening at the end of the tubes which I initially thought may be glue could well be slight oxidisation of the aluminium.

Would the frame fail catastrophically or would I get some warning, like a loose twangy bike?

Would be a real shame to turn this into a wall hanger
:(


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PostPosted: Thu Jul 01, 2010 4:22 pm 
retrobike rider
retrobike rider
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Joined: Mon Sep 21, 2009 10:17 am
Posts: 1303
Location: Lewes, East Sussex
I had an aluminium frame that had little bubbles where the tubes boneded to the lugs. It looked like it had been rebonded, albeit pretty shoddily.


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PostPosted: Thu Jul 01, 2010 10:27 pm 
Old School Hero
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Joined: Mon Feb 22, 2010 11:25 pm
Posts: 232
Location: North London
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 :lol:
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. :?


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PostPosted: Fri Jul 02, 2010 12:20 pm 
rider | rBoTM Winner
rider | rBoTM Winner
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Joined: Fri Jan 25, 2008 1:42 pm
Posts: 5132
Location: Wakefield, Yorkshire
chipper wrote:
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 :lol:
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!)


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