Re: is my wheel geomentry way out?
I agree with everyone else. there is probably something wrong with it. How much tread was left on the outside and centre of each tyre when the inner edge was bald? I think 166s are supposed to wear the inside edges of their front tyres out first - maybe the rears too, but by the time the inner edge is bald, the rest of the tyre should be pretty close to the tread wear indicators. Normally, lots of negative camber (wheels leaning inwards at the top) or lots of toe-out (harder to see visually but instead of being parallel in plan view, both tyres trying to steer outwards) can cause wear on the inner edges.
I think it's essential that you establish the cause BEFORE you cash out on a 4 wheel alignment check if at all possible. If you have the wheels re-aligned and then find that the wear was due to (say) a worn out track rod end or some other suspension joint, you'll only have to get it done again once the part has ben replaced. On the otehr hand, a good 4 wheel alignment check ought to be able to help spot which corner(s) is/are giving the problem.