Death of a Motobecane Grand Record
08-25-13, 07:46 PM
#26
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I dont know. He way bring it back and have us disassemble it. He needs some funds since he bought a fancy 853 frame bike.
08-25-13, 08:10 PM
#28
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Funny about that...always my thought to put such a fork on my GJ...course I'd have to ditch the cool looking cantis, can't have that!
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08-26-13, 08:17 AM
#31
No one cares
the rider of that frame sounds like a real cracker.
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08-26-13, 08:21 AM
#32
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What's the frame size? I am one of those guys that needs one of those 531 forks. Headset too......
08-26-13, 08:36 AM
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Steel may crack...Aluminum when it fails tends to be more dramatic....So I've heard....and CR.....just splinters! :-O
08-26-13, 08:44 AM
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That there is not a "crack". That there is what we Materials Scientists call "broken" and it don't get more dramatic than that. Fatigue is Fatigue is Fatigue, when they go bang, they is broken, it don't matter the material.
08-26-13, 08:48 AM
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It IS important to LISTEN to our rides....they usually will TELL us if there is a problem.....My bike is "Clicking"....REALLY?!? Could be nothing could be THAT!!!! NOT what I would want to find on a fast downhill run! ANY frame failure is a BAD thing, whatever the material, and they ALL have their breaking point. We trashed an otherwise nice old steel frame at the co-op the other night, because of a big chuck worn out of the chain-stay by a bent ring..... a frame failure waiting to happen.
08-26-13, 09:01 AM
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Interesting failure. I've seen the seat tube crack/separate at this junction, but never the BB shell itself. You'd think the tube would've cracked/separated prior to the thicker shell, wouldn't you?
Repair wouldn't be cost-effective in this case. Best to hang it on the wall in reverence and remembrance; it's done it's job and deserves retirement
DD
Repair wouldn't be cost-effective in this case. Best to hang it on the wall in reverence and remembrance; it's done it's job and deserves retirement
DD
08-26-13, 09:25 AM
#37
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I don't know what brand that shell is, but I know it's NOT a Nervex Pro shell.
I'd say it's a failure of the shell and yes that's unusual, but anything can break.
Internal rust may have contributed to this, but I think it's probably a defect in the part combined with manufacturing practice (might have been over-heated) and plain wear-n-tear (heavy, hammering rider).
I'd say it's a failure of the shell and yes that's unusual, but anything can break.
Internal rust may have contributed to this, but I think it's probably a defect in the part combined with manufacturing practice (might have been over-heated) and plain wear-n-tear (heavy, hammering rider).
08-26-13, 09:46 AM
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Seeing the workmanship on my grand rec, this comes as no surprise. Some things about overunionisation and the highest consumption of wine per capita made these old frenchies some marvels of bad industrial practice.
08-26-13, 09:52 AM
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Even so....I think I would put an OLD SCHOOL Moto up against a NEW Pacific Cycles built Moto....I picked up an 86 Nishiki Mixtion Craigslist earlier this year, and the guy had a one year old Moto he was also selling. The Moto was already rusting on parts that rust, a LOT of the components were really low end....and he wanted 3 times more for the Moto than the Nishiki....should have been the other way around!
08-26-13, 10:06 AM
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Even so....I think I would put an OLD SCHOOL Moto up against a NEW Pacific Cycles built Moto....I picked up an 86 Nishiki Mixtion Craigslist earlier this year, and the guy had a one year old Moto he was also selling. The Moto was already rusting on parts that rust, a LOT of the components were really low end....and he wanted 3 times more for the Moto than the Nishiki....should have been the other way around!
08-26-13, 10:35 AM
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Last edited by JohnDThompson; 08-26-13 at 10:40 AM.
08-26-13, 10:39 AM
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That's not an unheard of failure mode for a bulge-formed shell. An investment cast shell would be unlikely to fail in that manner, though.
08-26-13, 10:39 AM
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Yeah but a reasonable amount of wine consumption helps lower the incidence of heart disease and contributes to lower stress over cracked steel frames.
08-26-13, 10:44 AM
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True, but having a 32 hour work week and paid vacation every other week and pensions at 55 means these bikes get actually ridden! Can you believe how bad THAT is compared to a life in the garage's rafters?
08-26-13, 10:47 AM
#46
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hairnet, Could a BB with a shorter spindle have worked on that bike? I can see how a heavy rider capable of delivering BIG torque can break a frame in that area and that a longer spindle could make it easier for the frame to fail in the BB area.
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08-26-13, 01:57 PM
#47
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Yes; I've done that repair. It's unlikely the seat tube would need replacing, just sweat off the remains of the shell socket once the rest of the shell has been cut and sweated off. Still, it's a big job, and you'd be hard-pressed to find another metric tube diameter shell, much less another metric diameter Nervex-look shell to preserve the look.
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08-26-13, 02:17 PM
#48
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I couldn't agree more!
08-26-13, 02:26 PM
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It is easy, not to mention fun, to make the unions a scapegoat.Just for that reason, I'll make certain to 'pass the Dutchie on the drive side' should we ever meet.
Last edited by photogravity; 08-26-13 at 02:30 PM.
