Sounds like you've found it (though no other colliders are directly parents or children of the colliders). I have a wheel  backup collider (for when the wheel is upside down or otherwise not making contact wheel collider wise). Its a cylinder and its labeled WheelBCollider* compared to the wheel collider transforms for KSP wheel, labeled WheelCollider*.   There is also a box collider on the meshed object labeled WheelLowerBracket* Image of Hierarchy with one of each copied tree fu
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