https://67.15.36.49/team/Tutorials/co...displace01.asp

Here's a quick displacement tutorial that shows u how to control it. Use the placement node to position it where the tread is.

Also, do a google search for tire tutorials or something of that nature. You'll find quite a bit (i couldn't find one specifically for displacement maps) and they'll help you out. Also do a search for displacement map to get more in depth with it.

Maya's help system is also a good resource. It has step-by-step tutorials, so check that out.

I apologize for the rushed post, but I didnt have time to look too much for tutorials, but you shouldn't have any problem on google.