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What are they? How are they installed? And how do they work?<p>I recently got four new Toyo Proxes 4 tires. There was a bit of vibration in the steering wheel so I took them back and got the front tires spun and rebalanced. It helped some, but the vibration is still there at random speeds. One of the tire techs suggested I may need these hubcentric rings.
 

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Re: Hubcentric Rings. (jclaib)

The diameter of the wheel hubs on cars is not standard, even across the Volvo line, so aftermarket wheel makers cast their wheels with a large opening and offer specific rings that adapt the generic wheels to specific cars. These are called hubcentric rings. Essentially they are sized to exactly fit both the opening of the wheel and the diameter of the hub on your car. OEM Volvo wheels don't need them because they are cast for the exact size of your hub. Your Enkei wheels probably DO need them (and have them) because they are not made specifically for your S40. If they need them they should have come with them.<p>The rings can be made of plastic or metal and they usually snap into the hub opening of the wheels before mounting on the car. When removing wheels from the car you should always look to ensure that they come off with the wheel.<p>I purchased aftermarket Borbet wheels for my snow tires. The Volvo branded stock wheels that came with my car were made by Borbet and were cast with a hub opening matching the car. My aftermarket Borbets use hubcentric rings. Though they should work fine I still have problems with vibrations with the "aftermarket" Borbets.<p>Google hubcentric and you will find a wealth of information.
 

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Great post, jackf -- excellent explanation. <p>jclaib -- you can likely find hubcentric rings which will work from someone like America's Tire/Discount Tire. I recommend you get Aluminum (or metal) rings, rather than plastic as the plastic will fail eventually (particularly if you road race or autocross your car and switch wheels often).
 

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Re: (jclaib)

<A HREF="http://justforwheels.com/index.jsp?cat=hubcentric&sub=how&track=GHR" TARGET="_blank">http://justforwheels.com/index...k=GHR</A> <p>Try here this is where I got mine..
 

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Re: Hubcentric Rings. (jclaib)

I posted this in the Parts reference thread but I don't think many people visit there.<p><A HREF="http://www.1010tires.com/hubrings.asp" TARGET="_blank">http://www.1010tires.com/hubrings.asp</A> has 63.4mm and 63.36mm inner diameter hub rings. <p>The factory hub size is 63.4mm but just in case you want it to have a tighter fit, you can go with the plastic 63.36. The outer diameter of the ring depends on your aftermarket rim. In your case jclaib, for your Enkei RS6 it's 72.62mm.<br>
 
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