it could be a few things...
one, the wheels might no be true. Some of the associated wheel came out of the mould a little warped, but i thought they fixed the problem. check if it the wheel with out the tyres first if it isn't that, then make sure there is no play in the linkages or suspension.
It could also be the tyre and insert are not fitted to the wheel correctly make sure before gluing the tyre that insert aren't bunched up inside, ie the tyre profile is even all the way around and that the tyre is seated evenly in the bead.
Are the bearing inserted in the hubs so that axle cant wobble when it rotates?
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