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Old 07-26-07, 09:22 PM   #1
mNod
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Is it safe to ride decaying carbon? i will not hold you responsible!

My 1992 Trek 2300 is Eroding at the joints where the carbon joins with the aluminum, only on the top bar though, on the fork side. There is about a 3/4" circle of white clear coating. Right now it looks like the clear coating has just pulled away from the carbon, and the aluminum is slowly decaying. One guy at my LBS said it might be dangerous to ride, another at a diff LBS said it was fine until i hear it pop (sounds safe) From a poor description, what do you guys think? I tried to take some pictures but they are coming out horrible.

Thanks
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Old 07-26-07, 09:50 PM   #2
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No.
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Old 07-27-07, 01:31 AM   #3
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If the aluminum is decaying where it joins the carbon portion of the frame I would not ride that bike.
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Old 07-27-07, 01:35 AM   #4
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Carbon and aluminium is a fine battery, particularly when sweat is added. The current will break down the epoxy bonding the two pieces together. Degradation of the aluminium suggests galvanic corrosion (I know glavanic refers to metals only but near enough) is occuring.
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Old 07-27-07, 01:53 AM   #5
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Quote:
Originally Posted by mNod View Post
My 1992 Trek 2300 is Eroding at the joints where the carbon joins with the aluminum, only on the top bar though, on the fork side. There is about a 3/4" circle of white clear coating. Right now it looks like the clear coating has just pulled away from the carbon, and the aluminum is slowly decaying. One guy at my LBS said it might be dangerous to ride, another at a diff LBS said it was fine until i hear it pop (sounds safe) From a poor description, what do you guys think? I tried to take some pictures but they are coming out horrible.

Thanks
If you are the original owner the frame might have a lifetime guaranty. Perhaps you should look into a replacement frame.
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Old 07-27-07, 01:22 PM   #6
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I would not ride it. There was a thread about someone on the forum that encounter frame failure recently and was seriously injured. It just isn't worth it.
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Old 07-27-07, 01:49 PM   #7
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Failure modes:
Steel bends
Aluminum cracks
Carbon explodes
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Old 07-27-07, 03:12 PM   #8
mNod
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Thank you for all of your input. I think i might just retire my old bike and walk until i have the money for a new one. I was going to keep riding it until i made a few threads on here and got about the same kind of response form most people.

Now i just need to find a new bike to buy, dammit.
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Old 07-27-07, 03:17 PM   #9
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Why not just buy a new frame? Performance's XRL has good reviews as does Nashbar's AluC. Both are around $200. If you are really on a budget Nashbar has an all aluminum for as low as $90. Ebay also turns up quite a few frames at decent prices.
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Old 07-27-07, 05:26 PM   #10
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If you're the original owner, Trek will give you a warranty replacement frame. Corrosion between the carbon tube and aluminum lug was fairly common on those frames. Trek solved that problem a few model years later by clear coating over the joint thus preventing moisture ingress.
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Old 07-27-07, 05:34 PM   #11
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He's dead Jim
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Old 07-27-07, 10:00 PM   #12
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I watched an 'over the bars' accident up close. A 250 lb. guy launched, went about 10 feet, and landed on his eye in about 6" of mud. If it wasn't for the mud, it would have been a broken neck for sure. Regardless, he had a major head injury. DON"T risk it on a deteriorating frame. bk
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