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Old 11-27-12, 08:53 PM   #1
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Yellow material in carbon frame and hazy tones under coating?

I got this bike used (supposedly 1400 miles) and being my first carbon frame (it's a Cannondale Supersix) I was not capable of reasoning these two matters;

1st- I recently removed the seat post and was checking inside of the frame out of curiosity and this yellow material on the top tube and seat tube caught my attention. Is it a common material applied on connections?

2nd - Bike has the original yellow and jet black colors. When you observe the black areas under direct light, you can see this hazy tone differences under the coating (?)
Is this normal in carbon frames since it can be seen throughout the frame but not in a typical pattern? And what is it supposed to be? Resin?
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Old 11-27-12, 09:54 PM   #2
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The frame is shot. Send it to me for proper disposal. Or else it might asplode on you!
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Old 11-27-12, 10:00 PM   #3
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The frame is shot. Send it to me for proper disposal. Or else it might asplode on you!
How do we know this frame is shot for sure? Can you be more specific?
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Old 11-27-12, 10:05 PM   #4
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The haze and the yellow are a sure sign of impending asplosion. I will dispose of it safely for you.
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Old 11-27-12, 10:19 PM   #5
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Pictures over the web May just be a poor excuse for not doing the right thing.
Surely in Metro LA you have a bike Shop that sells those things to make an in--person inspection,
if these jokers are teasing you.
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Old 11-27-12, 10:25 PM   #6
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I really thought that I would get an articulate reply from a carbon frame guru or someone who could help, yet I failed to post this thread within the teasers' prime time.
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Old 11-27-12, 10:39 PM   #7
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Have you been riding this frame safely? Did anything happen to it recently like you slid into a fence or something? And how long have you been riding it that you have not had any problems. ANd have you had any problems? Answers??! Please.
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Old 11-27-12, 10:43 PM   #8
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Have you been riding this frame safely? Did anything happen to it recently like you slid into a fence or something? And how long have you been riding it that you have not had any problems. ANd have you had any problems? Answers??! Please.
I have ridden it for about 200 miles safely. No creaking, nothing sounds unusual. Before my possession, I don't know how it was ridden, nor can I advocate the previous owner. He claims that he never raced or crashed the bike and put 1400 miles on it.
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Old 11-27-12, 10:55 PM   #9
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It's really hard to tell but I would ride it. You shouldn't ride it, though. You should send it to rebel1916 so he can dispose of it before it asplodes.
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Old 11-27-12, 11:01 PM   #10
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It's really hard to tell but I would ride it. You shouldn't ride it, though. You should send it to rebel1916 so he can dispose of it before it asplodes.
Thanks! Do you guys gang up usually around this time in the forum?
rebel1916 can feel free to dispose himself, at least the frame still serves its purpose.
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Old 11-27-12, 11:10 PM   #11
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When you get that yellow stuff, it means the carbon is rusting.
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Old 11-27-12, 11:10 PM   #12
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You do realize that Rebel is just being facetious and wants you to send him the frame since it is perfectly fine to ride, right?

The reason is that for whatever reason, a lot of roadies tend to be VERY ocd about their bikes and panic or fret over tiny things that most people wouldn't even notice. So long timers see a newbie poster who is being very ocd about their bike on their first post and decide to tease them a bit.

All in good fun. If the frame was unsafe or warranted a serious look, I imagine Rebel would have said so.
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Old 11-27-12, 11:14 PM   #13
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Do you have a carbon seat post? Perhaps yellow stuff is carbon paste to keep a carbon seat post snug with seat tube. My Trek Madone has a seat cap that fits over the seat tube and requires carbon paste. Also, have a few similiar cosmetic blemishes under clear coat and have seen and heard of others having same. But, as previously suggested, bring to an LBS that has Cannondales so they can check it out.

I wonder if the blemish on what appears to be top tube is from a rider's
legs/spandex brushing tube while pedaling?

Last edited by bike_boy; 11-27-12 at 11:19 PM.
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Old 11-27-12, 11:21 PM   #14
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Yes, I do. However, the yellow material is inside the top tube (photo is taken from above the seat tube) so I don't think it has something to do with carbon seat post. I have the same cap too. And thanks for the first serious reply of the day. I will take it to an LBS for sure.
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Old 11-27-12, 11:21 PM   #15
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Please post larger pics. Not sure of frame area of second/middle pic. Back of head tube area?

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Old 11-27-12, 11:27 PM   #16
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Am I seeing a cable running next to what I presume is top tube in 3rd pic? Perhaps, blemish is from the cable rubbing the frame there. You could put one of those clear cable frame protector stickers under it.

I have tried any bike polish on these blemish areas?
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Old 11-27-12, 11:28 PM   #17
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Please post some larger pics. Not sure of exact frame area of second/middle pic you posted.
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Old 11-27-12, 11:39 PM   #18
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I got this bike used (supposedly 1400 miles) and being my first carbon frame (it's a Cannondale Supersix) I was not capable of reasoning these two matters;

1st- I recently removed the seat post and was checking inside of the frame out of curiosity and this yellow material on the top tube and seat tube caught my attention. Is it a common material applied on connections?

2nd - Bike has the original yellow and jet black colors. When you observe the black areas under direct light, you can see this hazy tone differences under the coating (?)
Is this normal in carbon frames since it can be seen throughout the frame but not in a typical pattern? And what is it supposed to be? Resin?
1: material inside the tubes is probably remnants of mold release, typically wax of some sort. Harmless.

2: all I can see in your photos is carbon "weave". This can be in a variety of patterns, or completely random. As long as the surface is smooth and unbroken, it's fine.

I was visiting family in Southern California over Thanksgiving. It was sunny and mid-70's. Go ride, you lucky basstid.
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Old 11-27-12, 11:40 PM   #19
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Head tube: Just cosmetic blemishes from useage to me. Wonder if someone tied an event ride number or strapped a top tube bag to frame near head tube? I also wonder if that curved line is supposed to be there as part of the frame mold. Perhaps look at a same frame online or at LBS to comapre for that curved line.

Top tube: That's gotta be brake cable rub there. You can get LBS to put on several little rubber donuts or maybe even a clear sleeve of exposed cable.

Cannondale logo (down tube?): Just looks like typical gravel road debris
scratch.

So, it looks like your good to go.

Last edited by bike_boy; 11-27-12 at 11:58 PM.
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Old 11-27-12, 11:46 PM   #20
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Top tube: That's gotta be brake cable rub there. You can get LBS to put on several little rubber donuts or maybe even a clear sleeve of exposed cable.
It's actually perfectly smooth on the surface and I can see these weaves in direct light. But a clear sleeve is a good idea for a potential rubbing. Thanks!
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Old 11-27-12, 11:52 PM   #21
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1: material inside the tubes is probably remnants of mold release, typically wax of some sort. Harmless.

2: all I can see in your photos is carbon "weave". This can be in a variety of patterns, or completely random. As long as the surface is smooth and unbroken, it's fine.

I was visiting family in Southern California over Thanksgiving. It was sunny and mid-70's. Go ride, you lucky basstid.
Riding almost every day! Thanks for the relieve by the way...
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Old 11-28-12, 01:08 AM   #22
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You do realize that Rebel is just being facetious and wants you to send him the frame since it is perfectly fine to ride, right?

The reason is that for whatever reason, a lot of roadies tend to be VERY ocd about their bikes and panic or fret over tiny things that most people wouldn't even notice. So long timers see a newbie poster who is being very ocd about their bike on their first post and decide to tease them a bit.

All in good fun. If the frame was unsafe or warranted a serious look, I imagine Rebel would have said so.
I wasn't in the mood. Seriously thought something might be wrong.
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Old 11-28-12, 05:31 AM   #23
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I for one, resent the implication, that my valuable services might be some kind of a prank.
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Old 11-28-12, 08:16 AM   #24
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The yellow "stuff" is probably something left over from the mold or something used for assembly. The hazy area is just a flaw that means nothing. Few things in life are perfect, and most carbon frames have this kind of flaw.
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Old 11-28-12, 08:20 AM   #25
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I wasn't in the mood. Seriously thought something might be wrong.
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