Your mesh settings indeed cure the problem but in so doing take the file size from 6 to 140 MB!
What I don’t understand is that I have exported the same design as a mesh with only a couple of structural alterations to parts not associated with those that produce the problem without issue. Normally, I don’t have to tamper with the default mesh settings at all.
How would you suggest I de-complicate the wide areas of the wheel? I assume you are referring to the 6 concave surfaces. I created these using the Network Srf command using only 4 open lines and do not see how I can make these surfaces simpler without losing the edge matching tolerance I wish for if moving to machined parts.