Quote -  Yes, you'll need to do a little UV work and shader domain work.  Create three seams, two circular ones and then a seam between them so you can unfold the entire tread using the Cylinder option. The tread area will need it's own shader domain so you can directly apply the map containing the displacement only to the tread area. 

I just did the displacement here but didn't apply any of the color.

Mark

Oh my god that is perfect!!!!

not to decipher what you stated..  
three areas/domains (each side wall and the tread area)
tread will need a seam across to take it from a donut to a flat long item use cylinder to unfold...
 apply displacement map to treads domain

should be it right?

been watching you're tut's over at VTC but even there you just used premade textures...  I think I get it now  :) sorta  :/ 

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Hexagon, Carrara, Sculptris, and recently Sketchup.