propose 'new' frame 4proto optibike1500

Nice find!

TrekY22.JPG


Yeah, the Y frame is a bit dated and now reminiscent of cheap bikes, but i dunno, i don't think it's all that bad. My issue with optibike is the pricing.
 
The Mantis Flying V MTB that appeared in the late 1980s was the first monocoque Y-shaped bike frame I am aware of:

mantisfl.JPG


In 1989, that might as well have been an alien spaceship. I don't think it has aged very well, though.
 
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