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I always wonder about this too. I'm a mechanical engineer but not at all a wheel/tire expert. I know they say that OEM designs are hubcentric, but I have trouble seeing how the clearance between a hub and wheel bore can be so tight that it is not overcome by the size and position of the nesting cones on the lug nuts and wheel. Especially in 5-10 years when everything is rusted out and the sizes have changed.

When I install wheels on my cars, I run all lug nuts down hand-tight. Then I go back and do them again while shaking the wheel a little, and at least some will always turn down a little more by hand. I take this to mean the wheel is centering itself on those nesting cones - which means alignment is lug-centric.

I agree that the hubcentric rings can't possibly support a load. The only thing they can possibly do is help with alignment of the center of the wheel to the center of the hub (and then in that case, with a plastic bearing surface that moves under load, how it not a lug-centric system?). If you want to put rings in there but have an odd size, two ideas are either to 3D print them or wrap shim stock around the hub.
 

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Hi Steverino, thanks for posting. I've read many articles on the subject, those videos were more helpful than all of them. They agreed with us that the lugs nuts are supporting the vehicle weight, not the hub (if it were the other way around, the hub/bore bearing surfaces would have to be so close together that you wouldn't be able to get the wheel on). It makes much more sense that a wheel falls off from nuts vibrating loose than it does from the studs shearing off. A good reminder to check torque every once in a while.

So OP, if they don't make rings in your size and you wanted to use material to center the wheel on the hub I'd probably wrap plastic shim stock with a thickness of less than .85 mm (.034") around the hub. Maybe go .005"-.010" less so you can get them on. Something like this would even allow you to tune it for about the same cost as the rings:

https://www.amazon.com/TTC-Color-Co...1512740686&sr=8-1&keywords=plastic+shim+stock

If you have a friend or a local library with a 3D printer, that could work too.
 
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