it’s not about precision but about the nature of shape casting.
we have discussed the issues of open wheels before and currently fgear can not handle those cases.
multi line casting handles this up to some extent but it’s not perfect, sphere and convex casting will directly fail. it might be possible to achieve similar results with sphere or convex but you would have to cast multiple times(no such feature available right now).
I think hybrid or pure rigid body wheels are more suitable for off-road sims and we don’t have that right now.