[DeTomaso] Wheel offset (ET)

Wed Aug 1 17:44:30 EDT 2012

Having said all that, Offset is simply a faster way to say the same thing
without doing all the thinking.

Michael

On Wed, Aug 1, 2012 at 5:43 PM, michael at michaelshortt.com <
michaelsavga at gmail.com> wrote:

> 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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>
>
>
>
>
> Michael L. Shortt
> Savannah, Georgia
> www.michaelshortt.com
> michael at michaelshortt.com
> 912-232-9390
>
>
> This email is protected by the Electronic Communications Privacy
> Act, 18 U.S.C. Sec. 2510-2521, is confidential and may be legally
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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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privileged.  If you are not the intended recipient, you are hereby notified
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communication is strictly prohibited.  Please reply to the sender that you
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