Since it was only mentioned in passing in The Friendly Place and appeared for the first time in The Eternal Dogfight, I think it would be better to dab it "Great Wheel (The Eternal Dogfight)".
Actually, this is the only Great Wheel: it does not need a dab term.
Talk about it here.
The Great Wheel was a spaceship that was the home of the Amstron race. (COMIC: The Friendly Place) In 2015, the Gate of Creation was onboard the Great Wheel. (COMIC: The Eternal Dogfight, The Infinite Astronaut)