kmltick said:
I'm curious, what are the symptoms that the bearings are going out?
Judging from the way it just pukes the belt, I'd have to say they give very little warning.
A bearing about to fail might make a grinding or whining or rumbling noise, and you might be able to see the pulley cocking to one side if it's really bad.
You probably need to use a mechanics stethoscope (or long metal rod/screwdriver/etc held against your thumb, your thumb aganst your ear) placed against the pulley bolt with the engine running to really tell, not for the faint of heart, and you probably would need to hear it with good bearings (to know what 'good' sounds like) 1st to tell if they were going bad.
Dave