Tires: Shaking in Steering Wheel, inflation pressure, steering wheel

Question
I have Shaking in my Steering Wheel, the dealer has rebalance the tires twice in a month and a half, what could cause this?

Answer
The tires are probably out of round.

This can be caused by irregul wear, which is in turn caused by misalignment and aggravated by insufficient inflation pressure and insufficient rotation.  There's not much you can do about once irregular wear has set in except to rotate your tires and wait for the new wear pattern in develop - erasing the old pattern.

However, if these are new tires, the tire dealer should replace them for you.