Understanding Hub Centric Ring Dimensions

Hey everyone,

I was trying to get some clarification on hub centric wheel adapters.

I understand the difference between hub centric and lug centric wheels, but I’m trying to understand how precise the tolerances have to be for hub centric rings to work properly.


Toyota hub bore is listed as being 106.1 mm. So am I right in assuming OEM Toyota wheels (and some aftermarket) would have exactly a 106.1 mm bore hole (probably wrong term for it)?


I know these are mass produced cars with mass produced parts, so there must be some level of variation in those measurements. So with that said:


If someone had aftermarket wheels with a center bore of 110 mm for example, they’d need to purchase a set of hub rings with 110 mm outer diameter and 106.1 mm inner diameter correct? And not 109.9 outer diameter with 106.2 inner diameter.


I hope this question makes sense. I came across a post here or another forum where someone had a hub centric ring that was a few tenths of a mm bigger than 106.1 mm and was getting some vibrations.


I’ve never worked with hubcentric rings, so I’m just trying to understand it.

 

Hubcentric rings are mass produced for common wheel bore sizes. 110mm and 108mm OD rings are readily available. 109.9mm will not be. Match the wheel bore with the closest ring dimensions available. Since the rings are plastic, they are easy enough to hammer into the wheel bore if slightly oversize.

 

Thanks. I probably should have clarified better; the 109.9 number I gave was just an example.

I was mainly wondering how this applies to aluminum hub centric rings (which I would think probably shouldn’t be hammered in).

 

^Aluminum rings could also be hammered into the wheel, but it may become "permanent". You'd also need to lather the ID in anti-seize so it doesn't stick to the hub register.