There are 4 of them. Im just curious what they are.

 

TPMS sensor ?

 

No the sensor is on the valve stem

 

Ahh is it the PAX system

 

Harmonic sound reduction device. How it works I do not know.

 

maybe the holes are tuned for a specific freq?

 

Ah i think it is the pax system! Thank you

 

Here's a link which opens a quick blurb on what they are. The specific mention of Acura is near the middle of the page.

http://dillaircontrols.com/dill/wp-c...OE-Recalls.pdf

 

In an effort to reduce cabin/road noise, Acura uses a polypropylene Helmholtz resonator that encircles the center portion of the inside of the wheel - this is supposed to significantly lower middle frequency noise.

 

That really and truly sounds like something they'd make up for a Star Trek episode.