Sounds like you may be describing shoulder erosion. If you are talking about erosion of the shoulder rib, it is a fairly common occurrence on lightly loaded truck steer tires.
It is caused by the center ribs being firmly planted on the road. By being planted more firmly to the road, they have a longer contact patch that then outer ribs that are not forced down to the road as hard. This causes the outer ribs to scrub more than the inner ones. The extra scrubbing causes some erosion on the outer shoulders of the tread.
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Sean
If Ain't a Newell, It Ain't Wurt Oonin!
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