About two weeks and 300 miles ago I changed the brakes on the front of
my van and noticed the 'normal' uneven tire wear on the inside of the
tread.  It was worn but not even close to bad.

This week, one of the tires is bald 1 inch in from the inside.  It most
certainly is excess wear.  I have no idea what could cause this fast
wear, any ideas?

Gregor