I think there is a butt load of tire modeling tutorials out there. I think there are mainly text, but hey, whateva. Just try a google search and see what pops up. Also I think that SM is coming out with a car modeling tutorial soon anyways.
Yeah SM's car tutorial should be up in the next couple of days it shows you how to build the tire with nurbs then texture it with a displacement map, show it also shows you how to get the best looking displacement with nurbs surfaces. I think that displacement is the best way to go around it as when you render it doesn't have to compute polys or nurbs surfaces
SimplyMaya specialises in Maya tutorials. We offer over 1,000 individual Maya training videos, ranging from basic Maya tutorials through to intermediate Maya tutorials. Our tutorials are created by instructors with industry experience and are designed to get you up and running in Maya quickly without making it seem like hard work.