Conversation so far:
What was unique about Obree's bike?
Obree had built frames for his bike shop and made another for his record attempt.
Instead of traditional dropped handlebars it had straight bars like those of a mountain bike.
Why did he want straight handlebars?
The bike has no top tube, so that his knees did not hit the frame.
The chainstays are not horizontal to the ground.
Thus.
What was the bike made out of?
CANNOTANSWER.

Question: What else was interesting about this bike?
Self-contained rewrite: Other than straight bars, what else was interesting about the Obree bike?