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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 12-09-07, 06:38 PM   #1
bward1028
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Drilled-through Carbon Fiber? Deathwish?



on an older carbon frame (think aluminum lugs)
would this be just asking for trouble?

the original owner drilled through the tubes to keep the brake bridge attached securely.
i'm wondering if it'll hold my 150#.
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Old 12-09-07, 06:40 PM   #2
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I wouldn't ride it, but I also just don't like bonded frames. If those holes were there from the factory, that would be one thing, but if they were added by the prior owner I wouldn't trust it.
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Old 12-09-07, 06:57 PM   #3
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it will work just fine till you hit a bump too hard and the rear triangle snaps off completely
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Old 12-09-07, 07:17 PM   #4
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Yeah that looks really scary. Probably a sweet ass older frame though.
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Old 12-09-07, 07:29 PM   #5
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I don't think the brake bridge would have held your weight regardless of the drilling ...









heh heh heh.


(Oh yeah, I probably wouldn't ride it, unless you have that section inspected/beefed up by someone like Calfee--I think they do carbon repairs)
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Old 12-09-07, 07:33 PM   #6
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Looks clean, but considering carbon's tendency to splinter...
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Old 12-09-07, 07:38 PM   #7
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all that for a brake.... =P
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Old 12-09-07, 07:45 PM   #8
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There are two things likely to happen. One: Stress fractures around the bridge make the frame unrideable. Or two, you slam the brakes, the rear triangle snaps and you go flying through the intersection if you havent fallen already.
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Old 12-09-07, 07:54 PM   #9
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Failure is imminent with that thing

it might be saved by engineering a metal collar (2 piece lugs) for both
stays and bonding them to the assembly. a frame expert
could do it.
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Old 12-09-07, 08:23 PM   #10
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I would not ride that thing no matter the price. Those are really thin CF stays to start with, and even drilling aluminum like that would make me nervous. Coupled with the forces that thing undergoes during braking (lets see.. F=ma. If you and the bike weigh 165lbs, that's 75kg. Let's say you're going 25mph (11.2 m/s) and want to slow to a stop over 3m (~10ft) in an emergency. That's an average negative acceleration of 20.9 m/s/s. Plug it back in, and you get 1568 N exerted on those two little seatstays.. those are a lot of newtons, my friend. It would be roughly equivalent to a guy twice your weight standing on them, but while wearing ice skates because the contact surface area is so small.) I wouldn't be surprised if they cracked eventually.

Sorry, I've been studying a lot of simple physics recently.

You know, if you're riding it fixed you likely won't be using a rear brake.. well either way, I wouldn't trust it.

Last edited by Boss Moniker; 12-09-07 at 08:31 PM.
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Old 12-09-07, 09:31 PM   #11
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I'd ride it until it failed catastrophically.

**** it man, we're not gonna live forever.
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Old 12-09-07, 09:45 PM   #12
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**** it man, we're not gonna live forever.
Be that as it may, I think most of us would still rather go without a splintered CF chainstay skewering our kidney.
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Old 12-09-07, 09:48 PM   #13
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"I died doing what I loved"
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Old 12-09-07, 09:52 PM   #14
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"I died doing what I loved"
riding a janky ****ing bike taht was doomed to failure
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Old 12-09-07, 09:53 PM   #15
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Even I, master of janky-assed-****, wouldn't touch that.
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Old 12-09-07, 09:53 PM   #16
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I'd ride it until it failed catastrophically.

**** it man, we're not gonna live forever.
Wait, let me get the video camera...

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Old 12-09-07, 10:03 PM   #17
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it will work just fine till you hit a bump too hard and the rear triangle snaps off completely
+1, also, why do you think the orig owner is selling it? cause he knows that bike is marked for death
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Old 12-10-07, 01:00 AM   #18
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**** yall, ride that ****, show how hard you are
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Old 12-10-07, 06:54 AM   #19
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**** yall, ride that ****, show how hard you are
He'll find out how soft he is if he take's your advise and that frame splinters underneath him.
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Old 12-10-07, 06:57 AM   #20
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I would not ride that thing no matter the price. Those are really thin CF stays to start with, and even drilling aluminum like that would make me nervous. Coupled with the forces that thing undergoes during braking (lets see.. F=ma. If you and the bike weigh 165lbs, that's 75kg. Let's say you're going 25mph (11.2 m/s) and want to slow to a stop over 3m (~10ft) in an emergency. That's an average negative acceleration of 20.9 m/s/s. Plug it back in, and you get 1568 N exerted on those two little seatstays.. those are a lot of newtons, my friend. It would be roughly equivalent to a guy twice your weight standing on them, but while wearing ice skates because the contact surface area is so small.) I wouldn't be surprised if they cracked eventually.

Sorry, I've been studying a lot of simple physics recently.

You know, if you're riding it fixed you likely won't be using a rear brake.. well either way, I wouldn't trust it.
Don't your calculations assume the lack of a front brake?

I wouldn't be surprised if those stays lasted a pretty long time. I'm guessing the original owner didn't do that recently. I still woudn't buy it though not only because of the the stays but also because those old cf frames are pretty ****ty.
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Old 12-10-07, 07:47 AM   #21
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Don't your calculations assume the lack of a front brake?

I wouldn't be surprised if those stays lasted a pretty long time. I'm guessing the original owner didn't do that recently. I still woudn't buy it though not only because of the the stays but also because those old cf frames are pretty ****ty.
The above statement tells me that you do know about early carbon frames but your contradicting yourself by saying,"I wouldn't be surprised if those stays lasted a pretty long time" then saying,"I still woudn't buy it though not only because of the the stays but also because those old CF frames are pretty ****ty." Im sure you know in the early years of CF frames everyone wondered why they were having headtube and bottom tube failures (amongst other faiures) then they found out that sand and small pebbles coming off of the front tire and hitting the bottom tube were causing micro fractures, and those tiny micro fractures were causing the bottom tube and headtube to splinter under stress, so what do you think drilling holes in the frame might do?
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Old 12-10-07, 07:59 AM   #22
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The above statement tells me that you do know about early carbon frames but your contradicting yourself by saying,"I wouldn't be surprised if those stays lasted a pretty long time" then saying,"I still woudn't buy it though not only because of the the stays but also because those old CF frames are pretty ****ty." Im sure you know in the early years of CF frames everyone wondered why they were having headtube and bottom tube failures (amongst other faiures) then they found out that sand and small pebbles coming off of the front tire and hitting the bottom tube were causing micro fractures, and those tiny micro fractures were causing the bottom tube and headtube to splinter under stress, so what do you think drilling holes in the frame might do?

Bottom tube?

Anyway, holes in carbon fiber are just fine. How do you think they mount brakes now? Or waterbottle cages, for that matter. Specialized also warranties their frames for life.
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Old 12-10-07, 08:33 AM   #23
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Bottom tube?

Anyway, holes in carbon fiber are just fine. How do you think they mount brakes now? Or waterbottle cages, for that matter. Specialized also warranties their frames for life.
This is because the guy with the fancy CAD machine says "hey, what happens if we cut holes here? oh, we're going to have to add some material."

Not when the guy with the fancy craftsman drill machine says "hey, i'm just going to cut this **** without thinking"
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Old 12-10-07, 09:38 AM   #24
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I have that same frame sitting right next to me with mostly stock shimano 600 components. It is a pretty "interesting" frame, but even without the dubiously directed drilling it is springy and noodley as hell. It's not a bad frame, but I don't know that I would recommend buying it (I got mine for free). Vintage carbon is not quite the same as vintage steel. The busted seatstays would be the deal-breaker.
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Old 12-10-07, 09:42 AM   #25
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ahem


TED SHRED IT!!!!
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