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problem with my 1993 specialized epic

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problem with my 1993 specialized epic

Old 09-09-08, 02:56 AM
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modjeska
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problem with my 1993 specialized epic

hi all,
a few years ago i noticed that the clear coat on my 1993 specialized epic had started to bubble/blister near the bottom bracket. i took it into the shop (very reputable) and they said its just the clear coat, nothing to worry about it can be lightly sanded and recoated. i didn't do anything about it since i wasn't riding much at the time and basically forgot about it. so recently i have noticed a significant peeling along the downtube and now the seat tube near the front derailleue clamp. i took it to another shop (i moved) while i was gettng fitted for a new frame and he told me that the problem could get much worse, ie causing the carbon fiber to delaminate? he said not to ride it anymore..
does this sound right? has anyone had experience with this issue? please advise as i would like to know either way so i don't injure myself.
thanks
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Old 09-09-08, 09:45 AM
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Tapeworm21
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Is this bike carbon lugged with steel? If so, you should have stopped riding that bike years ago.
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Old 09-09-08, 10:22 AM
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i have the lugged carbon bike...
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Old 09-09-08, 11:15 AM
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If the clear coat issues seem to be centered on the joints then I'd be worried that the joints are moving. If the clear coat is peeling just on a regular surface then you're fine. The second guy is only right if the peeling is at a joint indicating a possible joint failure. If it's just on a regular area and doesn't seem linked to any significant bash damage then there's nothing to worry about.

If you touch up the clear go easy on any sanding. You don't want to sand down into the actual carbon fibers. If it's dull looking under the blisters just lightly wipe with some wax and oil remover (autobody shop) or a bit of brake cleaner solvent on a paper towel and then clear it with something like a good polyurethane and a nice artists brush. If it's shiney they just barely break the shine back to dull with some 600 grit wetordry paper used wet.
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Old 09-09-08, 11:54 AM
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I have a 1991 Allez Epic too and there's some mild discolouring and corrosion around the alloy lugs. Mine started at the edge of the headtube lugs and worked inwards. I think it was caused by my facing the headtube prior to installing a new headset. This shaved away the top & bottom of the tubing and exposed the edge of the clearcoat. The headset didn't extend flatly outwards to seal the edge of the clearcoat, so it's exposed and the elements got to it over time (and cleaning solvents). Nothing to worry about really as it's between the clearcoat and underlying layers. I tried cleaning it up, but it's underneath the clearcoat so it's not going anywhere.

It's not a structural problem so I wouldn't worry about it falling apart. The guy at the 2nd shop doesn't know what the h#$@ll he's talking about. The cosmetic clearcoat and woven carbon-fibre on top is about 1mm thick. The real load is carried by the unidirectional fibres underneath, so unless you're peeling off the woven carbon-fibre layer, I wouldn't worry about it. These frames rarely fail and when they did, it was a gradual issue with the lug loosening slowly, like the early Vitus frames. You've got plenty of warning and have time to get a new frame.

We actually had one of these frames at our shop that Specialized cut up in pieces and sent to us as a showroom display. It was the late '80s/early '90s and people were a little leery of carbon-fibre frames. So we'd take hammer and smash the tubing on the Allez, nothing but a little scratch on the clearcoat surface. Then we'd take them over to a sample of steel and aluminium tubing and smashed that; and it smashed all right, completely flattened so that opposite sides of the tubing were touching. We sold A LOT of Allez Epics... heh ,heh..

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Old 09-09-08, 12:13 PM
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Actually carbon-fibre tubing in steel lugs would be better than aluminium lugs like on the Allez Epic. Steel and carbon are at the same level on the galvanic scale so there's no issues with anodic corrosion. But carbon and aluminium would cause corrosion. That's why there's a layer of fibre-glass between the alloy lugs and the carbon-fibre tubing.
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Old 09-10-08, 02:50 AM
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thank you all for the insight. i will be able to sleep better....
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Old 09-27-13, 11:45 AM
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Never mind, new thread started; http://www.bikeforums.net/showthread...r-coat-content

Last edited by Art Odd; 09-27-13 at 07:22 PM. Reason: started new thread
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