[DeTomaso] Wheel offset (ET)

Wed Aug 1 17:34:08 EDT 2012

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
> >>>
> >>> _______________________________________________
> >>>
> >>> Detomaso Forum Managed by POCA
> >>>
> >>> Archive Search Engine Now Available at
> http://www.realbig.com/detomaso/
> >>>
> >>> DeTomaso mailing list
> >>> DeTomaso at list.realbig.com
> >>> http://list.realbig.com/mailman/listinfo/detomaso
> >>> .
> >>
> >>
> >>
> >> --
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> 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
> >> Act, 18 U.S.C. Sec. 2510-2521, is confidential and may be legally
> >> privileged. If you are not the intended recipient, you are hereby
> notified
> >> that any retention, dissemination, distribution or copying of this
> >> communication is strictly prohibited. Please reply to the sender that
> you
> >> have received this message in error, then delete it. Thank you
> 
> 
> 
> -- 
> 
> 
> 
> 
> 
> 
> 
> 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
> Act, 18 U.S.C. Sec. 2510-2521, is confidential and may be legally
> privileged. If you are not the intended recipient, you are hereby
> notified
> that any retention, dissemination, distribution or copying of this
> communication is strictly prohibited. Please reply to the sender that
> you
> have received this message in error, then delete it. Thank you
> _______________________________________________
> 
> Detomaso Forum Managed by POCA
> 
> Archive Search Engine Now Available at http://www.realbig.com/detomaso/
> 
> DeTomaso mailing list
> DeTomaso at list.realbig.com
> http://list.realbig.com/mailman/listinfo/detomaso
> .
> 
> _______________________________________________
> 
> Detomaso Forum Managed by POCA
> 
> Archive Search Engine Now Available at http://www.realbig.com/detomaso/
> 
> DeTomaso mailing list
> DeTomaso at list.realbig.com
> http://list.realbig.com/mailman/listinfo/detomaso