Originally Posted by andypants
The first paragraph doesn't make much sense, but...
You should have enough room to slide the wheel forward
There is only enough room to slide the wheel forward 1-2cm but not enough to get the chain off the rear cog.
For speed's and difficulty's sake, I would rather patch a tube with the wheel removed than try to fight it with the wheel mounted. Is this what everyone does?
Here is a pic to show the wheel position all the way forward (except for 1-2cm for chain tension):
