AO

Hey DR,
Is Specialists ever gonna carry those negative spacers? How 'bout muffler bearings? Blinker fluid?

DR

Hi Andrew,

>Is Specialists ever gonna carry those negative spacers?

YES, they will be available shortly after I change the laws of physics :-)

>How 'bout muffler bearings? Blinker fluid?

Coming soon to a Wal-Mart near you :-)

DR

Heinrich,

FYI, what you are illustrating may be percieved as a " Wheel center line offset number away the center of the car" Offset. This may help

tomboyea123

I was able to get 18 x 10 carerra thin spokes all around on my 89 gt with no rubbing. I am running 255 35 18 front and 285 30 in the rears.I did have to use 1.2 degrees negative camber in the front to accomplish this.

GlenL

Correct

http://www.discountedwheelwarehouse....ment_Guide.cfm

DR

Heinich,

>DR my pic does not include the hub. it shows *only* the wheel.

I percieved the "black area" in your illlustration as the hub. On my 928s the Hub is closer to the outside of the rim than to the inside.

>DR your pics are the exact opposite of reality.

That is part of the problem, some people (wheel manufacturers) call one way negative and others positive. I have had this discussion so many times it even confuses me to this day.

OK, this will probably get confusing. I argued many times with some of the big wheel manufacturers and goes against the "street term" of positive and negative offsets. I finally grasped the desription after it was explained this way.

If you look at my written example you can see why I stick with the "negative version". Do you agree that ADDing a 20 mm thickness spacer (positive thickness) to a 65mm 928 wheel makes it "like" a 45mm right? (moves the wheel center line toward the outside of the car) If so, adding a postive number(spacer) can only decrease the amount of the original number if the orignal number is a negative number to start with ("positive 5" added to "negative 10" = "negative 5 right"?).

At the same time if you take what I call a 40 mm postive offset wheel and add 20 mm spacer to it then it acts like a 60mm postive offset wheel (also moves the wheel center line 20mm towards outside of car like a 60mm Positive offset would).

This is how it was explained to me by wheel manufacturers and is what I use.

If a spacer is expressed as a "negative number" then that is a different story and flip flops my description.

I know well that the "street" terms are opposite of what I described, but the math doesn't agree.

GlenL

Does a spacer move the hub out or the wheel flange in? One or the other but not both! I think it's a matter of perspective, gentlemen.

DR

Oh, the bottom line is no matter how you term it, you can't for example add a 13mm spacer to a 52mm 928 wheel to make it fit like a 928 65mm wheel.

No amount of descriptions is gonna change that. :-)

DR

>DR it is truly worth getting clear with those wheel guys.

OK Heinrich, you convinced me, I am wrong and will try to convince some of the pros that help me fit literally thousands and thousands of 928 wheels they are wrong also..When all is said and done, all of this is more based on which number description that makes the wheel stick out farther from the car (what I called positive), or a number description that makes the wheel tuck in farther under the car (what I called negative).

Call it whatever makes you happy :-). Just for my ole buddy I will in the future publicly call it "center line offset number towards the center of the car"(what I callled negative) vs "center line offset number away from the center of the car"(what I called positive), that should make it clear... IF I ever have this discussion again :-)

Now, lets debate "backspacing" numbers vs Offset numbers when compared to various wheel widths:-) Anyone game for that?

.....JUST KIDDING!!

FBIII

I like what tomboyea123 is running on his GT. 18 x 10 all the way around with 255's in the front and 285's in the rear. That seems like a more reasonable approach. Most of the discussion has centered on the need for larger rear tires. But what about the additional braking power of big reds et al. Wouldn't larger front tires make better use of the increased braking capabilities?

Jim_H

Dave please keep doing exactly what you're doing as you have been doing it. You set me up with a great set of wheels that did not negatively effect my Shark's handling. Furthermore you were concerned about keeping the overall height correct according to what Porsce intended. Under 25" as I recall??

DR

Hi Jim,

Thanks!

>Under 25" as I recall??

Actually dead on 25" or very, very close is what I prefer and is all I recommend, especially on the front. In the rear you can fudge a little, but I still don't want to get over 25.3" or so.

Gary Knox

It may interest some of you that Porsche made the 17" Cup 2 wheels in an 8" width with an ET 70 offset. These should work perfectly on the front of our 928's, and are a 1/2" wider than the 7.5" with ET 65 that was stock front on the GTS's. They called them "snow tires", and were fitted to some 911's. I just found a set of them to match my 17" X 9" Cup 2 wheels for the rear (ET 55) which are the most common 911 Cup 2 rear wheel. I've always thought the Cup 2 was one of the best looking OE wheels on the 928's.

Gary Knox
West Chester, PA

FlyingDog

blau928 is running 18x10 with 285 on all 4 corners.

928ntslow

UNBELIEVABLE!!!! I was laying in bed last night and it hit me that I totally explained it wrong! Unfortunately, I woke up early and was on the golf course this AM and didn't get a chance to redeem myself. What a bonehead!!!!!!!!!!!!!! I SHOULD have been using a wheel with a 65mm offset as an example. I cheesed it hard and I apologize for the misleading, false , "what in the hell is he talking about", info!



Maybe they SHOULD have been burning some bushes! I just read what I had posted and it is wayyyyyyyy off base. How embarrassing!!!