Isn't intelligence relative? I mean as others have said, knowledge sometimes outweighs perceived intelligence, so isn't knowledge as per the bike building chap intelligence?
Take someone who knows intimately how the internal combustion engine works, he understands the physics, the maths and schismatic’s however he couldn’t change a spark plug. He would be called by any acceptable standard intelligent, but is he more intelligent than the mechanic who can actually fix the car.