Here is a screenshot of how the mesh appear now with Invalid texture coordinates:

Aha, that explains. In your case you have to invert second texture coordinate.

Make it uv[idx].y = 1-uv[idx].y

Thank you,

I'm wondering why I had to invert the texture coordinate on (Y)

If you have time and have worked with Bullet Physics, please check out my question:

http://www.gamedev.net/topic/674726-vehicle-wheels-position/