[DeTomaso] Fwd: RE: Wheel offset (ET)

Wed Aug 1 19:29:26 EDT 2012

If the ride height changes ( as with most tire upgrades) the springs go up
and down and this causes new/different pull on the steering knuckle which
affects toe, not to mention camber since the wheel hub / steering knuckle
will be higher / lower in relation to the body since it moves in an arc.
IMHO

Michael

On Aug 1, 2012 7:09 PM, "Julian Kift" <julian_kift at hotmail.com> wrote:
>
> You are moving the tire in or out in a horizontal plane, so your not
changing toe, caster or camber, what aspect are you going to re-align?
>
> Julian
>
> ________________________________
> Date: Wed, 1 Aug 2012 18:58:40 -0400
> Subject: Re: [DeTomaso] Wheel offset (ET)
> From: michaelsavga at gmail.com
> To: shawkins777 at comcast.net
> CC: julian_kift at hotmail.com; detomaso at realbig.com; guson at home.se
>
> Absolutely true, plus any real difference in either direction really
necessitates a four wheel alignment.
> Michael
> On Aug 1, 2012 5:55 PM, <shawkins777 at comcast.net> wrote:
>>
>> You have to be careful though because you can affect the way the car
handles.
>>
>> Steve
>>
>>
>> ________________________________
>>
>>
>> From: "michael at michaelshortt.com" <michaelsavga at gmail.com>
>> To: "Julian Kift" <julian_kift at hotmail.com>
>> Cc: guson at home.se, "De Tomaso List" <detomaso at realbig.com>
>> Sent: Wednesday, August 1, 2012 4:43:04 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
>> > >
>> > >
>> > > This email is protected by the Electronic Communications Privacy
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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
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