[DeTomaso] Fwd: RE: Wheel offset (ET)
shawkins777 at comcast.net
shawkins777 at comcast.net
Thu Aug 2 01:52:19 EDT 2012
When you push the wheels either out or pull them in you change the scrub radius, see this link for more information http://en.wikipedia.org/wiki/Scrub_radius
Steve
----- Original Message -----
From: "Julian Kift" <julian_kift at hotmail.com>
To: michael at michaelshortt.com, "De Tomaso List" <detomaso at realbig.com>
Sent: Wednesday, August 1, 2012 11:11:06 PM
Subject: Re: [DeTomaso] Fwd: RE: Wheel offset (ET)
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
> >> > >
> >> > >
> >> > > 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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> >> have received this message in error, then delete it. Thank you
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