Attached Link: http://ectrr.com/Media/carraratire/

 OK, playing with trying to model a Mountain bike. Want to make it more than just a "plastic" model but I'm completely stumped with how to make and place images for displacement mapping or even just a bump map.  I can't figure out how you'd know what size to make it? how to orient it correctly and such....

I made a tire, all nice and pretty, not I could go in and make each and ever knob on it with modeling but shouldn't it be easier to just place a bump map or displacement map over it?  I'm trying but I just can't get how to size it in Photoshop or even get it placed correctly...

anyway, any help would be cool!!

 if you want to se what I'm working with the files can be had at the above link....

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Hexagon, Carrara, Sculptris, and recently Sketchup.