Here are some pretty cool "*****" (sp?) 18" wheels.
They are heavy, but strong. if you want some flash chrome rims, these are a great deal for $1500.

Let me know if you are interested.

The cool thing about them is that they are 8.5" and 11"s with 7" backspacing and 8" backspacing. they fit perfectly on a 928. (same fit as the wheels I have on my race car (9.5" with 8" backspacing and 11" with 8" backspacing)

you could fit EASILY, 255 up front and 285 in the rear on any 928.

these are brand new rims!



Mk

 

Get it on, pimp-daddy.

 

FOOSE ???
As in Chip Foose??

 

Fuchs

 

210 230 240, whatever it takes

Pimpdaddy out!

I think they are "Foose". Huh?????

mk

I think they look like those forglines i started with. WHAT??????

 

Price?

 

Heavy and tacky.

 

Offset calculator

8.5" - 57.1
11" - 50.8

 

They fit 928s, and that is the most important part. Ive never delt with offset. 8" backspacing for front and rear on 9.5s and 11s is 8". I thougth that was an offset of 65 rear and 85 front. Anyway, these do fit.

pretty shinney though!!

by the way, how do you get 50.8mm for an offset for the 11s with 8" backspacing?

 

How heavy?

 

Backspace and offset are two ways of describing where the wheel sits in relationship to the hub. As such, there is a relationship between the two making - it possible to convert from one to the other.

Backspacing is the easiest to understand. It is simply the distance from the back of the mounting pad to the back lip of the wheel. It is measured by laying the wheel on its face, placing a straight edge across the wheel, and then measuring down to mounting face. The higher this measurement the more the wheel is pushed inboard towards the car’s centerline, as shown in the illustration above.

Offset is the distance from the mounting surface to the centerline of the wheel, expressed in millimeters. Positive offset means that the wheels are pushed inboard towards the centerline of the car like a car with front wheel drive. Negative means that the wheels are moved outboard towards the fenders, widening the track.


TO CONVERT OFFSET TO BACKSPACING:

For positive offset wheels: (Wheel Width +1)/2 + (offset * .03937)

For negative offset wheels: (Wheel Width +1)/2 - (offset * .03937)

TO CONVERT BACKSPACING TO OFFSET:

Backspacing – (Wheel Width + 1)/2 * 25.4 = offset

Round this result to the nearest milimeter. If the answer is a negative number the wheel has negative offset, if positive then a positive offset.
http://www.mickeythompsontires.com/t...p?bulletin=s10

 

So what would that be in Porsche speak = ET?

 

Plug in your own numbers

http://autolounge.net/calculators/tirespacing.html

See the numbers I posted above

 

Using backspacing to determine wheel fit sucks. There is no standard on backspacing. Some calculators factor in wheel lip and some don't. And the ones that do factor it in just put in a generic 1" or something. It's very inaccurate because not every wheel has the same lip. ET on the other hand is always accurate.

Dan
'91 928GT S/C 475hp/460lb.ft

 

Agreed Dan ... but ET tells only part of the story. You have to use backspacing anyway to figure out where your parameters are. How wide can a wheel physically be to fit into a 928 fender? Once you know that, you need to know where the hub needs to mount in that space. That means knowing ET.

THeoretically we should be able to make a table that says:

For an S4:
Max wheel size (guess) 13-inch
Hub location on a 13" wheel, to clear both stock shock spring/suspension bits AND fender: XXXX
One inch Smaller:
bla bla bla ....