Conversation so far:
Did Graeme Obree use an unusual bike?
Graeme Obree called his bike Old Faithful.
Was Graeme Obree's bike Old Faithful custom made?
Old Faithful has a narrow bottom bracket, around which the cranks revolve, to bring his legs closer together, as he thought this is the natural position.

Question: How did the design affect the bike's performance?
Self-contained rewrite: How did the design affect Graeme Obree bike's performance?