I have used the roughing method, using a wire wheel; And also the punch method.
The punch method works extremely well. It will make it hard to take off an old tire.
I am seriously considering the knurling method this time around.
Like I keep trying to tell everyone...
Lots of good useful info in that Steve Smith book; "Dwarf Car Technology". Hence, the quotation marks.
There just isn't much out there for these small cars. Things like the screws in the beads, or roughing the bead seat area, are old school racing tricks that a lot of people have forgotten.
Steve