Tire size question

[Strat Fan]

Personally I wouldn't be happy without a centering spigot on the back of any car that runs reasonable power, weight & traction.
Yes you can argue that the wheel is centered on the bolt/nut tapers but a positive centering location is essential in my mind.

[ProtoTipo]

Yes you can argue that the wheel is centered on the bolt/nut tapers but a positive centering location is essential in my mind.

I agree, it takes the vertical load on its own.