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

Thu Aug 2 00:16:25 EDT 2012

That's what I meant, if there is no change in ride height or
any substantial change in backspacing, I wouldn't re-align either.

But If I were going from stock Campys to 17" wheels and super wide tires
like 335/35/17, I certainly would.

Michael

On Thu, Aug 2, 2012 at 12:11 AM, Julian Kift <julian_kift at hotmail.com>wrote:

>  Maybe I am missing something, I'm not questioning that if you change tire
> diameter and ride height etc. you'll need a realignment. The original
> statement implied that simply by altering backspacing alone in either
> direction a realignment is warranted, but I can't see anything has changed
> in that scenario. However, if you are saying that changing backspacing
> requires different alignment settings, that I can understand.
>
> Julian
>
> > Date: Wed, 1 Aug 2012 19:29:26 -0400
> > From: michaelsavga at gmail.com
> > To: detomaso at realbig.com
> > Subject: [DeTomaso] Fwd: RE: Wheel offset (ET)
> >
> > 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
> > >> > >
> > >> > >
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> > >>
> > >> --
> > >>
> > >>
> > >>
> > >>
> > >>
> > >>
> > >>
> > >> Michael L. Shortt
> > >> Savannah, Georgia
> > >> 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

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