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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 05-03-06, 03:28 PM   #1
sivat
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foam filled frame?

I know that theres a trick in the automotive world to fill the frame of a car with foam to gain stiffness without a lot of weight. Has anyone ever done this with a bike? Would seem that if you wanted a super stiff but nice riding track bike, it might be a good way to go.
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Old 05-03-06, 03:32 PM   #2
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The foam "trick" in the automotive world is used in the design of stiffer monocoque frames, it's not there to actually add stiffness, just part of the manufacturing. It's also added to silence an otherwise noisy box frame.

Cannondale "fixed" the problem of it's old raven frame from sounding like a drum by filling them in with foam.
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Old 05-03-06, 03:42 PM   #3
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Originally Posted by AfterThisNap
The foam "trick" in the automotive world is used in the design of stiffer monocoque frames, it's not there to actually add stiffness, just part of the manufacturing. It's also added to silence an otherwise noisy box frame.
thats true in the OEM, but there are guys who do it to cars to stiffen them up after the fact. it probably doesn't add much stiffness, but it can't hurt.
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Old 05-03-06, 04:08 PM   #4
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i was at a lbs yesterday and they had a disected bottom bracket with about 4 inches of the downtube and seat tube and the seat tube section was filled with foam. The frame was a bianchi aluminum i think but it could have been steel. I'd never seen it before or heard it mentioned before this. This post has no value, go about your business. Cheers.
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Old 05-03-06, 04:20 PM   #5
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yeah, OEMs fill for sound deadoning and stuff like that. People use heavy duty window sealant caulk and just go nuts on their engine mounts too, it actually makes a bit of a difference in how tight everything feels.
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