how do these odd bikes work

I always loved Bob Roll's Velo News articles about mtb racing- his stories are fantastic

*edit- I have no idea what I wanted to say so I cleaned it up
 
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this rather fine gentleman rather liked them I believe.

robin-williams-bicyle.jpg
 
I think there’s a bit of rubber attached and as the swing arm gets pushed down it stretches it somehow?…

But there is the obvious problem of, “hmm the seat could go a bit lo- oh”
Apparently you could slide the seat backward or forward according to your weight: further forward and you don't sag so much if you're heavy; further back and you sag more if you're light. Or something like that.

Thing is, if you're heavy you're likely to be taller and want the seat further back -- ie higher, no?
 
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