New trend?

Thanks, I will try to notice the wheels the next time I see a container truck.

 

Hub pilot are not Budd. Stud pilot are were Budds. There are two ways to Center the disk wheel. Stud piloted had lugnuts that were rounded, and there was an indent in the wheel. When you tightened the lugnut, it centered the wheel. The system used right hand threads for the right side and left hand for the left. The inner wheel was attached with a threaded lugnut that had a square head. Then the regular lugnut screwed onto that to attach the outer wheel. The good, they center properly, the bad, you could cross thread, and it took twice as much work to undo a dual. This system is still used on cars, except all the lugs turn the same way.
Hub pilot are called Unimount. Only one lugnut is used per dual, and all are right hand threads. The problem is they can be off center by 2/32" so they are not as smooth, unless properly mounted.

 

This is an NSPZ chassis. Norfolk Southern has been using disk wheels and more importantly, tubeless for quite a while. Many if not most chassis in Chicago have tubeless tires. The main holdouts are TSXZ, which are CSX, and old Pacer, which are now UP. BNSF were mostly tubeles, and I never pulled an NSPZ that had tube type tires.