Have a new Trek Madone 4.5. Took it for a ride and it started shimmying (?) on downhills.

Hopefully, this doesn't sound too weird.

I looked at it later and the front wheel seems like it is 'out of round'. When I spin the wheel, it doesn't rub the brake pads, so it seems true from that standpoint. But its like it is weighted more on one side.

Does this make sense and does anyone know what it might be?