Overlay or draw a curbed zigzag

[Kostya SkyDragon]

Hello guys
This is my unfinished drawing

http://www3.picturepush.com/photo/a/...--blurred2.jpg

I need to make a curbed zigzag line (black) along the front tire and two paralel zigzag lines along the back wheel

like here

http://www.tiresusa.com/media/catalo...USA.com-31.jpg

Or How can I overlay a pattern on the middle of the tires so it looks realistic like it's curved (maybe I need to change the shape or something but idk how)

A pattern like this

http://www.mosaiczone.com/UploadFile...2814497658.jpg

Please explain me the 2 ways in detailed steps
Thank you.

[colleague]

for example i typed some accents to make the zigzag and did a text warp
to match the tire and for effect also an inner shadow

for the pattern i did "transform warp" to match the tire and gave it a white shadow


motorguy.psd