[DeTomaso] Wheel offset (ET)
Will Kooiman
will.kooiman at gmail.com
Thu Aug 2 13:24:05 EDT 2012
Seems unlikely with ball bearings, but you never know.
On Aug 2, 2012, at 12:21 PM, Damaadams wrote:
> I was under the impression that wheel offset was also designed to correctly transmit loads to and through the wheel bearings. Wheel bearings, I think,?are ideally loaded in the vertical plane. Offsetting the wheel from the designed load axis introduces a constant eccentric load. I remember my buddy in high school who ran chrome reversed wheels and promptly destroyed his wheel bearings. I may well be wrong on all this. Jack, what do you say?
> ?
> Daryl Adams
> Mangusta 8MA888
> ?
> original message-----
> From: michael at michaelshortt.com <michaelsavga at gmail.com>
> To: Julian Kift <julian_kift at hotmail.com>
> Cc: guson <guson at home.se>; De Tomaso List <detomaso at realbig.com>
> Sent: Wed, Aug 1, 2012 4:54 pm
> Subject: Re: [DeTomaso] Wheel offset (ET)
>
>
>
>
>
> The problem is that there are too many number flying around.
>
> The only number that matters for 90% of most applications is backspacing,
> how it differs from stock.
>
> If the backspacing is a larger number, the wheel rides inboard more, if it
> is a small number, the wheel sticks out more.
>
> If the wheels are wider or smaller, you just have to do the math.
>
> let's say a car is OEM with an 8" wheel with 4" of backspacing,
>
> you want to buy a 10" wheel with 6" of backspacing
>
> Your wheel is 2" inches wider, and rides inboard 2" more, therefore, your
> exterior appearance should not look any different.
>
> If on the other hand, you want to use a 12" wheel with 3" of backspace,
> then the wheel will stick out past the
>
> OEM outer most point by 1" for the backspacing plus another 4" for the
> wider wheel for a total of 5",
>
> you are now driving a skateboard or have plans to install flares.
>
> Michael
>
>
>
> On Wed, Aug 1, 2012 at 5:34 PM, Julian Kift <julian_kift at hotmail.com> wrote:
>
> > In my experience backspacing depends entirely on the wheel manufacturer
> > you are talking to and worth clarifying with them up front. Kodiak and most
> > others I have dealt with here in the US use the tire bead i.e. inner rim lip
> >
> > Kodiak has a worksheet on their website, which may or may not help you.
> > http://www.kodiakracingwheels.com/ordering.html
> >
> > Whose wheels do you have? I think there was a very quick jump to the
> > conclusion the part #'s represent the offset, which may or may not be the
> > case, but some substantiation is likely warranted.
> >
> > Julian
> >
> > > From: guson at home.se
> > > To: michael at michaelshortt.com
> > > Date: Wed, 1 Aug 2012 12:44:30 -0700
> > > CC: detomaso at realbig.com
> > > Subject: Re: [DeTomaso] Wheel offset (ET)
> > >
> > > When calculating ET the reference is the middle of the tire which in
> > > turn is determined by the inner edges of the rim. You can assume that
> > > the outside of the edge is 1/2" further out on each side of the rim but
> > > especially on aluminum rims this measurement can differ from side to
> > > side on the rim. My calculations were assuming that your reference was
> > > the same for BS and rim width. If they weren't my calculations are off.
> > >
> > > Rim width is always inside the lip. Backspacing is measured outside the
> > > lip like Michael says.
> > >
> > > Tomas
> > >
> > > <-----Ursprungligt Meddelande----->
> > > From: michael at michaelshortt.com [michael at michaelshortt.com]
> > > Sent: 1/8/2012 7:51:57 PM
> > > To: Bjoern Flesland
> > > Cc: Tomas Gunnarsson,POCA Detomasolist Realbig
> > > Subject: Re: [DeTomaso] Wheel offset (ET)
> > >
> > > I do not think they use the lip, I think they use the outside edge, as
> > > in the part that touches the ground when it lays flat.
> > >
> > > Michael Shortt
> > >
> > > On Wed, Aug 1, 2012 at 1:43 PM, Bjoern Flesland <bflesland at gmail.com>
> > > wrote:
> > > > But stampings does not match quite up with the calculations that Tomas
> > > did.
> > > >
> > > > So I am confused!
> > > > Can it be measured in different ways?
> > > > Cheers Bjoern
> > > >
> > > > Sent from my iPhone
> > > >
> > > >
> > > > Den 1. aug. 2012 kl. 20:08 skrev "michael at michaelshortt.com"
> > > <michaelsavga at gmail.com>:
> > > >
> > > >> Yes, I think that is exactly what that means.
> > > >>
> > > >> Michael Shortt
> > > >>
> > > >>
> > > >>
> > > >> On Wed, Aug 1, 2012 at 1:06 PM, Bjoern Flesland <bflesland at gmail.com>
> > > wrote:
> > > >>> Thanks for helping out.
> > > >>> They are stamped the following:
> > > >>>
> > > >>> Front
> > > >>> 28 85 8 LA3
> > > >>> 8.5JX18H2E64
> > > >>>
> > > >>> Rear
> > > >>> 28 13 8 LA
> > > >>> 13JX18H2E39
> > > >>>
> > > >>> Could that indicate ET of 64 and 39 mm?
> > > >>>
> > > >>> Cheers Bjoern
> > > >>> Sent from my iPhone
> > > >>>
> > > >>>
> > > >>> Den 1. aug. 2012 kl. 19:36 skrev "Tomas Gunnarsson" <guson at home.se>:
> > > >>>
> > > >>> If you have used the same edges as reference for all measurements
> > > the narrow
> > > >>> rim has ET70 and the wide rim ET51.
> > > >>>
> > > >>> Tomas
> > > >>>
> > > >>> <-----Ursprungligt Meddelande----->
> > > >>> From: Bjoern Flesland [bflesland at gmail.com]
> > > >>> Sent: 1/8/2012 6:22:47 PM
> > > >>> To: POCA Detomasolist Realbig
> > > >>> Subject: [DeTomaso] Wheel offset (ET)
> > > >>>
> > > >>> I am trying to determine the offset (ET) of two wheels and need some
> > > advise:
> > > >>>
> > > >>> One wheel measure 184 mm from the mounting face/flange to the inner
> > > rim
> > > >>> edge.
> > > >>> Wheel width is 228 mm.
> > > >>>
> > > >>> The other measure 216 mm from the mounting face/flange to the inner
> > > rim
> > > >>> edge.
> > > >>> Wheel width is 330 mm.
> > > >>>
> > > >>> Appreciate your help. Thanks!
> > > >>> Cheers Bjoern
> > > >>>
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> > > >>
> > > >>
> > > >>
> > > >> --
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >> Michael L. Shortt
> > > >> Savannah, Georgia
> > > >> www.michaelshortt.com <http://www.michaelshortt.com/>
> > > >> michael at michaelshortt.com
> > > >> 912-232-9390
> > > >>
> > > >>
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> > >
> > >
> > > --
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Michael L. Shortt
> > > Savannah, Georgia
> > > www.michaelshortt.com <http://www.michaelshortt.com/>
> > > michael at michaelshortt.com
> > > 912-232-9390
> > >
> > >
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> --
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>
>
>
>
>
>
> Michael L. Shortt
> Savannah, Georgia
> www.michaelshortt.com
> michael at michaelshortt.com
> 912-232-9390
>
>
> This email is protected by the Electronic Communications Privacy
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> communication is strictly prohibited. Please reply to the sender that you
> have received this message in error, then delete it. Thank you
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