Conversation so far:
What did Graeme Obree do with bikes?
Nicknamed The Flying Scotsman, Graeme Obree is a Scottish racing cyclist who twice broke the world hour record, in July 1993 and April 1994.
What kind of bike did Graeme Obree build?
Graeme Obree's bicycle was built with parts from a washing machine.
What was special about Graeme Obree's bike?
Obree called his bike Old Faithful. It has a narrow bottom bracket, around which the cranks revolve, to bring his legs closer together.
What other features does Graeme Obree's bike Old Faithful have other than a narrow bottom?
The bike has no top tube, so that Graeme Obree's knees did not hit the frame.
Does Graeme Obree's bike Old Faithful have other custom features besides a narrow bottom and no top tube?
The chainstays are not horizontal to the ground. Thus the cranks can pass with a narrow bottom bracket.

Question: What other things did he add to the bike?
Self-contained rewrite: What other things did Graeme Obree add to his bike, Old Faithful besides a narrow bottom, no top tube, and non-horizontal chainstays?