You know, he's right. Good catch meimk.
I bought some off road type tires once and they all turned out to be out of round. Didn't feel it off road, but on the road it was wobbly.
The tire could be damaged, causing the wobble.
The rim could also be bent. I've had that happen too.
Try switching the tires around to the other sides. See if the wobble changes sides.