Texture moves wrong with wheel rotation

I ran into a problem with a texture rotation scipe. It is a wheel rotation script. It worked fine with the tire texture I was using. A friend made a new tire texture for me. After aligning it and testing it on my bike, instead of only rotating the correct way it is shifting horizontally about 90° so the treads are on the sides of the tire.
Here is the wheelRot script I am using. I also tried it with another wheel rotation script and it did the same thing.

default
{
    state_entry()
    {
        llSetTimerEvent(0.20);
    }
    timer()
    {
        vector vel = llGetVel();
        float speed = llVecMag(vel);
        if(speed > 0)
        {
            llSetTextureAnim(ANIM_ON | SMOOTH | LOOP, 0, 0, 0, 0, 1, speed*0.5);            
        }
        else
        {
            llSetTextureAnim(ANIM_ON | SMOOTH | LOOP | REVERSE, 0, 0, 0, 0, 1, speed*0.5);
        }
    }
}

That's likely your problem right there. If by "aligning it", you mean you had to adjust the repeat, rotation, and/or offset settings in the editor, then that's where you went wrong. The script will override any parameter settings you put into the editor. The texture has to fit properly with all settings at zero, or else the animation won't work.

It sounds to me like your best bet is to rotate the texture 90 degrees in an image editing program (or ask your friend to do it, since he/she made it).