7" FUCHs offset different fronts & rears

Hi,
just reading the other posts about FUCHs and offsets.

realise a car could have had 7" Fuchs from the factory either as fronts , with 8" or 9" rear wheels

or as rears, using 6j at the front.



Question is:

Did they make different 7" Fuchs , one sort with offset to be used as rears, and a second type with a different offset to be used as fronts?

or do all 7" fuchs ( as suplied for 911s ) come with the same offset?

[marcesq]

All 16x7 inch fuchs have a 23.3 mm offset. 7 inchers that went on 944 turbos have spokes that are different to allow for caliper clearance, but they have the same offset.

[Eric Coffey]

If you are just talking about the 16" Fuchs, then yes, all 7's will have the same offset. There are 7x16 Fuchs used on the front of 944 turbos that have the same offset as well (yet they actually have more brake caliper clearance). These will have a "951" prefix in the part number, as opposed to a "911".
Also, the rear of the 944 turbos used 8" Fuchs but with the same offset as the 911 7", so they will work on the front of a 911.
The only 911's that used 7x16's on the front (from the factory) were the 1978+ 930's.

Here is a list of recommended 16" Fuchs wheel combos for your car (some may require rolling fender lips):

911 6's & 911 7's
911 6's & 911 8's
911 7's & 911 8's
911 7's & 911 9's
951 7's & 911 8's
951 7's & 911 9's
951 8's & 911 9's (some say this is the ultimate set-up)

[Wil Ferch]

Guys:
I have a technical article written and archived on Rennlist that lists all Fuchs suitable for 911 use, including offsets, backspacing and Porsche part numbers. I also identify further information sources.
For the life of me...I can't seem to cut and paste to repost here !
Look at Rennlist archives...

---Wil Ferch

[ttweed]

Originally posted by Wil Ferch
Guys:
I have a technical article written and archived on Rennlist that lists all Fuchs suitable for 911 use, including offsets, backspacing and Porsche part numbers. I also identify further information sources.
For the life of me...I can't seem to cut and paste to repost here !
Look at Rennlist archives...

---Wil Ferch

Wil-

I found it- see if this works (I know the columns won't line up):

Listers:
Since my last post on this topic, in answering Sami Dakhlia, I went through my own files, and these were complemented by later posts from Mike Piera, Bill Verburg, and John Haley. Combining all sources of info, and noting that there are 25.4 mm for one inch, we get:
model size part number offset backspace
944Turbo 16x8 951.362.117.00 23mm 125mm
944Turbo 16x7 951.362.115.00 23 112
911 16x7 911.362.115.00 (early) 23 112, 911.361.020.44 ( late) 23 112
911 16x8 911.362.117.00(early?) 10.6 112, 911.361.020.45 (late?)
911 16x6 911.362.113.00 (early) 36 112, 911.361.020.43 ( late) 36 112
930 16x9 911.362.119.00 15 130
More information on these ( and other ) Porsche wheels can be found in the following reference sources:
- Porsche Panorama, Sept 1996, p.27
- Porsche Panorama, Dec 1989
- Upfixin der Porsche, Vol 8, p.179
- Porsche Panorama, April 1995,
- Excellence , June 1995, p.107 by Jim Pasha
- 911 Performace Handbook , Anderson 2nd ed, p.215
Most of these papers were authored by either Bruce Anderson, or Jim Pasha, both with excellent credentials. Nonetheless, there are errors in both lists, mainly simple errors in transposing model numbers ( Anderson), or mixing up of 7" and 8" wheel data (Pasha). The backspace column of the chart in the Sept '96 issue of Pano seems to uniformly overstate the backspace by 0.35 " for all cases ( strange...). I *believe* the above list above is correct, but if I'm not, I'll be in good company . Hope this helps clear
up some confusion on this topic.
---------------------

It looks like you didn't include 15" wheels, though, Wil, only 16s. It should be noted that in answer to the original question, there is one 7" Fuchs wheel that does not have the 23mm offset, and that is the 7x15" 911R wheel, which has a 49mm offset, I believe, to fit the rear of an early narrow body 911 with 225 tires on it. You aren't likely to find many of these, though, as the supply/demand ratio is very low.

TT

[Wil Ferch]

Tom:
Thanks for finding and pasting my Rennlist post.
911R wheels have a 45 mm offset..
---Wil Ferch

THanks for all the info!

( I had had a look at the 7" x 16" we have here and couldn't find an offset No. )

next question - I have 4No. 16" Fuchs, but they are all 7"
Any suggestions for tyres:

though the rim sizes are all the same - will there be any advantage in having narrower tyres at the front, e.g. :

205 x 55 at ther front with 225 x 50 at the rear

or could I have them all on 225 x 50 R16?

Thanks for any suggestions.

[Wil Ferch]

Oxford Hippo:

It seems I always follow the beat of a different drummer....here is my set-up and why:

I have an 85 Carrera that originally came with 6x16 front Fuchs, and 7x16 rears....205/55 front....225/50 rear...standard configuration. My car has limited slip and I always felt there was a lot of low sped push in the corners...( high steering wheel angle corners). Admittedly, this can be overcome to some degree by driving technique...yet I still wanted a mechanical "cure" for this.

Understeer can be tmamed with a wider front track ( than before) ...plus... wider tires and/or wider wheels that plant the shoulders of the tires more squarely than before.

Therefore, I'm running 7x16 fronts..with 205/55 tires..and 7x16 rears..with 225/50 tires.

Wonderful difference...especially on the track. A lot of people use 7 fronts and 9 rears...and IMHO..this leads you back to gross understeer at low speed turns. not all bad, mind you, but then other techniques need to be done to address the understeer, like larger rear sway bars or torsion bars...altered suspension set ups, etc. However, your objective ( looking cool with 7's and 9's)...might be more important than function..so it all depends what your target is.

---Wil Ferch

[ttweed]

Originally posted by Wil Ferch
911R wheels have a 45 mm offset..

Wil-
Not according to BA's table (I looked it up to verify)- they are indeed a 49mm offset. Of course, you can't believe everything you read, and although I have seen some of them, I don't actually own any to go out and measure....
TT

[Wil Ferch]

Tom:
I stand corrected...49 mm it is....
Sorry for the confusion


---Wil Ferch