[DeTomaso] Wheels - New Source - Group Buy

[Ken Green]

I would suspect that because no fit is exact there is not a single simple answer.  There are simple lug nuts with a taper against the wheel that can bear some lateral load, there are lug nuts with cylindrical portions that bear against matching cylindrical recesses in a wheel and would bear a lot more load, and the actual fit of a hub centered wheel to the hub has some tollerance.  But it does seem a lot easier to mount a hub centered wheel than to wrestle the wheel into a correct position w.r.t. the lug nut studs.
 
Ken

--- On Sat, 9/25/10, Tomas Gunnarsson <guson at home.se> wrote:


From: Tomas Gunnarsson <guson at home.se>
Subject: Re: [DeTomaso] Wheels - New Source - Group Buy
To: MikeLDrew at aol.com, detomaso at realbig.com
Date: Saturday, September 25, 2010, 8:55 AM


IMO what Tire Rack writes is not entirely correct. The hub fit is there to
locate the wheel while it's being mounted. Once the nuts or bolts are tight
the clamping force against the hub will take care of any loads be it from
rotation or vertical motion. If the centering rings were actually loaded
plastic rings wouldn't work too well, would they?

Tomas

-----Original Message-----
From: detomaso-bounces at realbig.com
[mailto:detomaso-bounces at realbig.com]On Behalf Of MikeLDrew at aol.com
Sent: den 25 september 2010 07:37
To: lotus0005 at hotmail.com; detomaso at realbig.com
Subject: Re: [DeTomaso] Wheels - New Source - Group Buy


In a message dated 9/24/10 19 53 47, lotus0005 at hotmail.com writes:


> Mike, I've followed several of this thread - what does "hub-centric"
> mean? 
>

Sorry...it means that the center of the wheel indexes perfectly on the
protrusion on the hub.   You could remove all the studs, lay the wheel in
place
and spin it and it would stay perfectly centered.

Lug-centric wheels rely on the conical face of the lug nuts (or lug bolts
on German cars) to center the wheel, and the center of the wheel doesn't
touch the protrusion on the hub.

Adapters are available to allow a lug-centric wheel to index properly on
this protrusion.   Here's a nice example:

http://www.miata.net/garage/hubcentric.html

These rings are widely available from any good tire store, Tire Rack,
Amazon etc.   All you need to know is the outside diameter of your hub, and
the
inside diameter of your wheel center.

Tire Rack says this on the subject:

====

Make certain that the wheel's installation hardware is correct for the
vehicle and in good condition. Since almost all of today's cars are designed
with hub centric wheels which transfer the vehicle's load from the center of
the wheel to the car's hub (and allow the lug nuts/bolts to just hold the
wheel against the hub), it is important that track wheels continue to be hub
centric to help distribute the forces encountered on the track. If an
aftermarket wheel requires special centering rings to properly fit it to the
hub, be
sure they are installed and installed correctly.

====

Cheers!

Mike
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