Conversation so far:
What was unique aboutGraeme Obree's bike?
Graeme Obree 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 Graeme Obree want straight handlebars?
Graeme Obree placed them closer to the saddle than usual and rode with the bars under his chest, his elbows bent like those of a skier.

Question: What was the bike made out of?
Self-contained rewrite: What was Graeme Obree's bike made out of?