Join Date: Dec 2006
Location: Long Island, New York
Bikes: a lowrider BMX, a mountain bike, a faired recumbent, and a loaded touring bike
Mentioned: 1 Post(s)
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How sturdy? Fiberglass is as strong as steel.
Here's a picture with a half inch of latex foam over the seat pan:
You might not be able to tell the seat-pan is concave with the padding on it.
The rest of the bike is quarter inch thick fiberglass, except the top of the fairing, which like the seat is three sixteenths of an inch thick.
I sold this bike for twelve hundred dollars and I'm testing another. The new one is a BMX with a banana seat (no picture available), but it has a Suzuki fairing, not a homemade fairing.
I was able to make an impression of my arse by sitting in a pan of joint compound, with a layer of saran-wrap on top, so it didn't stick.
Although it has worked for me, I must say that the underlying support structure is holding most of my weight (I weigh 250 something), and the seat pan is bedded in silicone caulk. I don't know if it would work with traditional seat rails. (with a seat post).
This bike used up eighty yards of four inch wide fiberglass tape and almost two gallons of resin.
Sorry I didn't reply sooner, the bike forums server is very slow on some days.