[928uk] wheel offset

[David Porter]

Graham

See the diagram I did for the website: http://www.928.org.uk/wheels.html

The Boxster came with 16" wheels as standard. The 17" Cup style (5 spoke)
was an option. The 7J fronts are shared with the 996 (original standard
wheel) and have a 55mm offset - about the lower limit for a 928. The rears
differ between Boxster and 996 (8.5J vs. 9J) although look very similar.
Both will fit the 928. The 996 rear wheel has exactly the same dimensions as
the GTS (Diameter/width/offset)

I will send you a picture of a GTS on Boxster 17" direct.

I opted for the 996 wheels.

David '90 S4


----- Original Message ----- 
From: "Manning, Graham" <graham.manning at tso.co.uk>
To: "Phil Chadwick" <citecpmc at citec.qld.gov.au>; "nicholas skudder"
<drnickyeah at hotmail.com>
Cc: <928uk at 928.org.uk>
Sent: Tuesday, July 06, 2004 8:56 AM
Subject: RE: [928uk] wheel offset


> Does anyone have any details of sizes and offsets of Boxster wheels? I've
seen several 928s with them fitted and was wondering if these might be a
viable alternative to the cups.
>
> - Graham
>
> -----Original Message-----
> From: Phil Chadwick [mailto:citecpmc at citec.qld.gov.au]
> Sent: Tuesday, July 06, 2004 12:35 AM
> To: nicholas skudder
> Cc: 928uk at 928.org.uk
> Subject: Re: [928uk] wheel offset
>
>
> nicholas skudder wrote:
> >
> > i am running mille miglia cup 2 replica rims in 17" and they have the
> > technicaly wrong offset.  i know plenty of others also use this wheel
and im
> > interested in opinions as to whether you experience more tramlining with
> them than with the standard wheels.  at first i was prepared to accept
this
> > on the basis of the wider rim and tyre contact patch but driving the SE
with
> > its 8" wide front rim and similar tyre contact patch is much better in
this
> > regard ie it dosent tramline as much.
> >
> > is this because of the offset?  how do you guys with 18" rims get on??
>
> Hi Nick,
>
> There's a lot of factors at play, but I reckon that front offsets
> less than 55 mm will usually cause noticable tram-lining, particularly
> on 1986/87 and later cars with 4-piston Brembos (where the scrub radius
> was changed from -16 mm to -10.2 mm to accommodate the bigger brakes).
>
> What offsets do you have?
>
> When people change offsets initially, they often go from 16" to 17"
> wheels, get new rims, new tyres, and new alignment.  With all these
> variables, not to mention a lot of pride in the "new look", the wider
> rubber, and the money spent, objective assessment of the outcome
> might be difficult.
>
> This is why I think that the "back to factory" test is a good one.
>
> I have recently seen observations from two different 928 owners who
> "went back" to wheels with 65 mm front offsets (both started with
> "third party" wheels and front offset not greater than 55 mm).  They
> also kept the same tyres, so the only variables were offset and metal
> wheel weight.  One, a 928 S4, went back to factory standard S4
> (7-slot) 16" wheels.  The other, a 928 GT, went to factory standard
> GTS 17" cup wheels.  Both observed that they thought the steering was
> OK before the change, but were *stunned* at how good it was after.
>
> Note that factory standard 928 metal wheels are quite light, typically
> 17 lb front and, on later cars, 19 lb rear.  The GTs had lighter wheels
> than that (down as low as 16 lb on the early ones, I think).  Not sure
> about the SE, but I expect it had GT wheels?
>
> I think I have heard that that the Mille Miglia cup 2 replicas might
> be a wee bit heavy, but not sure of my facts there.
>
>
> -- 
> Phil
>
> Herblock's Law: if it is good, they will stop making it.
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