Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

Worried about CF

Old 04-13-07, 11:03 AM
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Worried about CF

So, I remember reading on these very same forums about how carbon fiber will melt or spontaneously combust if left out in the sun for too long. Now I'm worried as my PF is in the back of the car and, as I was walking away from it, I noticed the sun was beating down on the rear triangle. Should I go move my car? Open the windows perhaps?

What is the mechanism I need to protect from? Is it the UV light (A or B) or the heat?

I should mention that it is somewhat cool out, about 34 deg., but it's expected to be about 43 deg. later!

Of course, my frame is the most susceptible to this as it was made in China! Someone please tell me what to do!

Signed fretting in Detroit.
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Old 04-13-07, 11:08 AM
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Originally Posted by Bike Lover
So, I remember reading on these very same forums about how carbon fiber will melt or spontaneously combust if left out in the sun for too long. Now I'm worried as my PF is in the back of the car and, as I was walking away from it, I noticed the sun was beating down on the rear triangle. Should I go move my car? Open the windows perhaps?

What is the mechanism I need to protect from? Is it the UV light (A or B) or the heat?

I should mention that it is somewhat cool out, about 34 deg., but it's expected to be about 43 deg. later!

Of course, my frame is the most susceptible to this as it was made in China! Someone please tell me what to do!

Signed fretting in Detroit.
If its still safe just get it out of the car, you have already lost the bike, you don't want it exploding in the car and needing to redo the entire interior. Sorry for your loss.
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Old 04-13-07, 11:08 AM
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Just lather it with some SPF 30. No neeed for 45 it's just overkill and that would just be plain silly...
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Old 04-13-07, 11:08 AM
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Sorry to tell you that your car has been contaminated as well.
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Old 04-13-07, 11:08 AM
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Originally Posted by Bike Lover
Signed fretting in Detroit.
What does your guitar have to do with this?
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Old 04-13-07, 11:20 AM
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A good question. Detroit as you know is one of the hottest cities in the world because of its lattitude...even hotter then Arizona in the middle of summer. Since I too am from there, I put sunscreen on my bike, SPF 30 works pretty well. I would suggest you crack a window but in that town, a good chance the window will be broken anyway and the bike stolen...so suggest you just ride it like ya stole it.
Good Luck,
George
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Old 04-13-07, 11:37 AM
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Hmm. Good thoughts. There is a Target across the street. Should I get one of the "sport" sunscreens or will any be sufficient?

Of course this is also what I'm worried about...bvfrompc

If its still safe just get it out of the car, you have already lost the bike, you don't want it exploding in the car and needing to redo the entire interior. Sorry for your loss.
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Old 04-13-07, 11:41 AM
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You left your bike in your car in Detroit....

No worries about the carbon exploding...

Because someone took it out of your car for you...
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Old 04-13-07, 12:00 PM
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I should probably say "Detroit area," I'm actually in suburbia.

Although, while I was at school in Detroit proper, I used to leave the doors to the Fiero GT unlocked and parked on the street, but, unfortunately, I still have it...
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Old 04-13-07, 12:18 PM
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While you're at the department store, don't bother with the sunscreen, just get a backup.
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Old 04-13-07, 12:22 PM
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Originally Posted by Bike Lover
So, I remember reading on these very same forums about how carbon fiber will melt or spontaneously combust if left out in the sun for too long. Now I'm worried as my PF is in the back of the car and, as I was walking away from it, I noticed the sun was beating down on the rear triangle. Should I go move my car? Open the windows perhaps?

What is the mechanism I need to protect from? Is it the UV light (A or B) or the heat?

I should mention that it is somewhat cool out, about 34 deg., but it's expected to be about 43 deg. later!

Of course, my frame is the most susceptible to this as it was made in China! Someone please tell me what to do!

Signed fretting in Detroit.
I once saw CF spontaneously turn into ball lightning.

UV light degrades several polymers, and the ones that your bike matrix is made out of could be one of them. I don't know how much UV light your glass blocks (if memory serves, it should be most of it), but if you're worried, throw a towel over it.

Chances are that your bike polymers were cured at a temperature well over 100F. If it was summer, I might suggest you crack a window, but I wouldn't worry about it AT ALL today.

Except for the car thieves who will throw your bike in a dumpster.
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Old 04-13-07, 12:32 PM
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I would think you can safely paint your bike with a can a spray paint to protect the carbon fiber.
This will protect it from the suns harmful rays.
As for the heat I believe you will alway need to keep you bike indoors with AC of course.
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Old 04-13-07, 12:48 PM
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Originally Posted by Bike Lover
I should probably say "Detroit area," I'm actually in suburbia.
Of course you are and so am I...why we have computers and road bikes.
As to your Fiero GT...only a quick side bar. Being a Detroit suburb kid growing up in the hey day of the auto industry, street racing was pretty popular as you know. Ever been to the woodward Dream cruise? Anyway...a few years ago, I pulled up next to a Fiero GT in my M3 and as you know Fiero's even with the V6 weren't the fastest. But....I could tell this wasn't a run of the mill Fiero GT. As it turned out, it had a warmed up LS-1 motor in it. I chatted briefly with the owner at the light and we agreed to have some fun so we took off and my M3 is pretty quick..maybe a high 13 second car but that Fiero just ran from me....likely a low 12 second car.
Anyway, some Detroit musings. Too windy to ride here today. May do Stoney this weekend.
Cheers,
George

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Old 04-13-07, 12:51 PM
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Originally Posted by ElJamoquio
I once saw CF spontaneously turn into ball lightning.

UV light degrades several polymers, and the ones that your bike matrix is made out of could be one of them. I don't know how much UV light your glass blocks (if memory serves, it should be most of it), but if you're worried, throw a towel over it.

Chances are that your bike polymers were cured at a temperature well over 100F. If it was summer, I might suggest you crack a window, but I wouldn't worry about it AT ALL today.
hilarious. CF is cured at ~280F, but withstands temps much higher after curing.

you guys know this is just a troll? right?
 
Old 04-13-07, 01:05 PM
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Originally Posted by DocRay
hilarious. CF is cured at ~280F, but withstands temps much higher after curing.

you guys know this is just a troll? right?
Ya think?
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Old 04-13-07, 01:08 PM
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If you toss it and as it is skipping down the pavement, you see sparks, it has lost its tensile strength and could be toxic to small animals...
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Old 04-13-07, 01:09 PM
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carbon fiber irritates lesbians.
 
Old 04-13-07, 01:10 PM
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Frame is likely worthless at this point. At least you have a nice set of components.

You might want to take the opportunity to try out a new frame material. For frame durability, pound for pound, nothing really beats iron. It'll last forever, as long as you keep it free from moisture, and it makes for fun hilly descents.
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Old 04-13-07, 01:13 PM
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You can't baby those fibers too much. Maybe add a LOX cooling system to the frame for those really warm days. . . .
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Old 04-13-07, 01:14 PM
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Originally Posted by DocRay
you guys know this is just a troll? right?
i know who this person is & they're definately not a troll.

Bike Lover: don't worry about your frame.
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Old 04-13-07, 01:18 PM
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Originally Posted by grebletie
You might want to take the opportunity to try out a new frame material. For frame durability, pound for pound, nothing really beats iron. It'll last forever, as long as you keep it free from moisture, and it makes for fun hilly descents.
Rust is always the enemy. I advocate concrete-clad rebar as the frame material of the future.
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Old 04-13-07, 01:19 PM
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I'm more worried that you live in Detroit.
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Old 04-13-07, 01:27 PM
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Ahhhh....Detroit...a city so bad it was the perfect setting for a movie about a robotic supercop.

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Old 04-13-07, 01:36 PM
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Originally Posted by recursive
While you're at the department store, don't bother with the sunscreen, just get a backup.
Okay. What the H*ll is the point of a "carbon fiber wrapped aluminum road frame"?
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Old 04-13-07, 01:40 PM
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I suggest you wait till you get back and then try the frame out.
If you ride in it (getting in and out of the saddle) and the frame snaps, let us know a few things:
a) your weight
b) temperature the bike was at in the car and for how long
c) force with which your behind hit the saddle when the bike fell apart
d) was it an american or european swallow?

If it doesn't break, then leave it in the car and record a higher temperature. When it does break, share your results with us!

(I'd totally buy this from Wally World)
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