When is the best time to buy tires?

[Darren Madams <darren@madams.com>]

Just curious when the first batch of "next years tires" come out
and if it's OK to buy the first batch or wait until they get a
couple out and tested first.  How long does it take for those
first batches to trikle down to Tire Rack?

Particularly concerned about 195 or 205 Kumho's for my friends Miata
but since it's probably generally useful info, copy the list.

        --D