Here the displacement map used in the one screen shot. Note that it's obviously just to test how strong a displacement each value presents. But I'd still like the text portions to come out a little crisper. So the sample value had to be on the high side.

When I get around to doing the actual tread pattern, I'll do something better. But I notice already that I'll probably be using a brightness range of 30 - 70 for the sidewall stamping and siping of the tread. (Seems easy enough, since a HSB brightness value of 50% at 0% saturation is the same as using 127,127,127 in RGB, but more straight forward.)

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Barbequed Pixels?

Your friendly neighborhood Wings3D nut.
Also feel free to browse my freebies at ShareCG.
There might be something worth downloading.