Bent wheels, do I need new tyres?

[cpalmer@dingo.webo.dg.com (Chris Palmer)]

Ok, the dealer tells me that the vibration that just showed
up on my S6 is due to:

- two bent wheels,
- an out-of-round tyre on a third wheel.

Too many potholes around here.
The wheels are MSW Type 55 with Pirelli Winter 210s on them.

So I have a few of questions for the wisdom of the list:

Assuming I replace the two bent wheels, should I replace the tyres also.
ie. is it possible that the tyres are also damaged?

What would cause a tyre to go "out-of-round" and should that tyre be
replaced?

I was running the 210s at 38psi, is this enough or should I inflate
them to something higher. I am thinking that a higher pressure may
protect the rims more.

thanks
-- 
Chris Palmer                                "Ashes to ashes,
Data General Corporation                     dust to dust,
Enterprise Solutions Engineering Division    If Lillee don't get you,
chris_palmer@dg.com                          Thommo must!"