FYI... this needs to be in the first post to save people some money.
The fitment of the Proline Protrac wheels sucks.
The wheel bottoms out on the raised shoulder of the hex before the wheel bore engages the axle. This makes it wobbly, and combined with the thicker hub, the nyloc nut doesn't fit well.
I think this wheel MIGHT work with a hex that doesn't have the shoulder, perhaps the Tekno slash 4x4 one. Until then these protrac wheels are going on the shelf.