The bearing itself does not wear, but the shoulder on the spindle that the inside bearing inner race rests against will wear/gall, especially if the car is subjected to a lot of cornering loads. The spindle shoulder wears rather than the shoulder on the bearing race because the spindle material has a lower hardness, and this wear is what causes clearance to increase with use assuming that the bearings themselves do no spall.

Duke

alright, i bought the gauge, what is the approximate reading in inches?

Look at the first response to your original post.