Fw: [Syncro_T3_Australia] Re: Wheels and ET

 
 
-------Original Message-------
 
From: nerdnetty
Date: 27/11/2007 11:24:40 PM
Subject: [Syncro_T3_Australia] Re: Wheels and ET
 

--- In Syncro_T3_Australia @yahoogroups. com, "Ken" <unclekenz@. ..>
wrote:Hey Ken,
Probably syncro is worn out so if you want to wreck it i
will buy your decoupler if its cheap ??????????
Cheers Pete

>
>
> Gday Ben and Les and ALL,
>
> Well well well, live and learn eh and thanks a lot for your
> contributions. Sounds to me then it would be no simple task to actually
> measure an ET while a tyre is on the rim, let alone on the vehicle.
>
> So here I am thinking all along my Merc ET49 rims were tracking wider
> and hence offering greater stability, not narrower as per your
> explanation. The proof in the pudding then I suppose would be to try
> measuring the outside tracking width wheel to wheel of the Merc 15" and
> compare that to the Syncro 14" tracking width, as they are both 6" rims.
> By your explanation then, I should find the Merc 15" overall width is
> narrower.
>
> In my case, the Merc ET49's never rub on the suspension, only on those
> small black plastic splash guards on the rear of the wheel arches,
> usually when on either lock. And when I bought the syncro, there were no
> rubbing marks on the splash guards at all, despite the wheels having
> been on for around 15 years with 3 previous owners. The rubbing only
> started in the off-road driving at Batemans Bay Syncro Tour 2007. Could
> that mean then this syncro has never been off-roaded? Or else, I'm way
> too overloaded.
>
> Cheers.
>
> Ken
>
>
>
>
>
>
>
> --- In Syncro_T3_Australia @yahoogroups. com, "BenT Syncro" <syncro@>
> wrote:
> >
> > On 11/26/07, Ken unclekenz@ wrote:
> > >
> > >
> > > Gday ALL,
> > >
> > > Probably not just for me, would someone please explain to us in
> laymans
> > > terms, from where to where on the wheel rim and/or centre that is
> the ET
> > > offset. So, as my original (but now spare) set of 14" syncro rims
> are
> > > marked ET30, I'd like to be able to physically measure it and other
> > > rims.
> > >
> > > Ben T says up to ET45 on 15" rims still won't rub. He may well be
> right.
> > > I do know my Merc 6Jx15H2 ET49 wheels do rub, for some occasions on
> > > uneven offroad circumstances when on a lock. Also the centres in
> these
> > > Merc rims are only about 3.5mm thick, whereas my 14" syncro rims are
> > > around 4.5mm. These 15" Merc rims have been on since around 1992.
> > > However, I still cannot see any physical damage or distortion.
> > >
> > > Also, as many of us are running our camper syncros at maximum and
> beyond
> > > Gross Weight of 2.5 ton, I suspect the body is sitting lower
> relative to
> > > the wheels. Hence an increased possibility of rubbing.
> > >
> > > Cheers.
> > >
> > > Ken
> >
> >
> >
> > Ken,
> >
> > To elaborate on Les' response to your question, the bigger the "ET"
> number,
> > the more the inside rim of the wheel goes inward. It is also important
> to
> > consider the width of the wheel. For example, if you have an ET30
> wheel
> > which is the same offset as stock but go to a width of say... 11
> inches. The
> > inside rim will still make contact with the suspension components. For
> our
> > purposes, I feel we should limit wheel width to 7 inches at ET30.
> Anything
> > wider requires adjusting the ET accordingly. As another example, I
> have a
> > 2wd Vanagon (T3) with 8" wide wheels. I had to correct the offset to
> ET20 to
> > get it to fit though it now ticks out too far outward for full fender
> > coverage. Here's a nice diagram to visualize how it works. Keep mind
> out
> > Syncro use "positive" offset.
> >
> > http://kmhafer. datsun510. com/wheel_ offset.jpeg
> >
> > Just another note: The 6 inch (152.4mm) wide Syncro wheel at ET30 will
> have
> > 106.2 mm of it's total width sticking INWARDS and only to 46.2mm to
> the
> > outside of the fenders. If my math is correct:
> >
> > Centerline of the wheel is 152.4mm ÷ 2 = 76.2 mm
> >
> > Inside rim is 76.2mm + 30mm (ET30) = 106.2mm
> >
> > Outside rim is 76.2 - 30mm (ET30 again) = 46.2mm
> >
> > I hope that didn't make it more confusing.
> >
> >
> > BenT
> >
>

 
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