Every 930 rear from '75-89 has the same part #, from the feedback here it appears to be 28mm

28mm? I need to dig this other set out and see what the part numbers are. Could it be that they are from something other than a 911 or possibly an aftermarket manufacturer has used the 911 part number scheme? The spacers and studs I am currently using on my widebody SC came from the stock 930 donor car use for the build. Something is fishy .........

I am interested in these as well as the Lindsey's, what tire sizes can fit on the 9" and 11"?

F: 245/45/17?
R: 315/30/17?

I have searched but Jack's car and several of the others have 9.5 on the front. What will fit on the 9&11.

The rear spacers on my 83 ROW 930 are 28mm.

John

mcvgums, that combination works great on a 930. Ask me how I know...

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Front; to have the outer edge of a 9" wheel sit in about the same place as the outer edge of a stock 7" wheel, w/ the 21mm spacer the o/s needs to be +36mm, this assumes the flanges are the same thickness.

Assuming a .3125" flange thickness the specs of the wheel are
Front Offset: +36
Front Backspacing: 5.729"
Front Frontspacing: 2.895"



Rear: to have the outer edge of an 11" wheel( discarding the 28mm spacer) sit in about the same place as a stock 9" w/ 28mm spacer it would need a +12mm o/s
Assuming a .3125" flange thickness the specs of the wheel are
Rear Offset: +12
Rear Backspacing: 5.729"
Rear Frontspacing: 6.285"


If you want to retain the 28mm spacer in the back the o/s would need to be +40mm
Rear Offset: +40
Rear Backspacing: 7.387"
Rear Frontspacing: 4.238"

Thanks Bill, Those 11s are going to be DEEP. Hope they come out looking as nice as the stock 16s.

Moses, Since you already have a set of 7.5 & 9, what are the chances of getting some actual measurements of them?

I need total overall edge to edge width and either front or back space.

They will be off the car this weekend and I'll measure them. Thanks again, Bill.

By the way, he's also planning on making 6" X 15" "deep 6's". The price could be a bit higher because of the smaller market, though.

That would be great, you understand what is needed?

Thanks for the initial calculations on the 11 inch project. I am a little confused with the number. In both wheel specifications, with and without spacers, each wheel seems to have the same backspacing even though the offsets have been altered. How is this possible? I like the idea of spacers on my car at the visual expense of sacrificing some deep offset since it will allow me to fine tune the actual wheel/tire location in the wheel well. Thanks again.

My bad, I ccopied and pasted the last set w/o filling in all the pertinent #s

Now corrected.

From your diagram, you want the overall rim width and the backspace from which you'll calculate offset, right?

http://forums.pelicanparts.com/uploa...1177523702.jpg

Yes, I cut 2 pieces of stiff lathe that lays across the edges but clear of the tire, hold them together w/ rubber bands unless you have help. A third piece across the mounting face can help but isn't necessary
http://forums.pelicanparts.com/uploa...1177523913.jpg

Bill, were these calculations based on a Turbo or an SC (RSR) rear hub/swingarms assembly? I understand that there is about an inch difference in the actual hub face position in the fender well. Thanks again.

All based on stock turbo suspension and fenders, and flange widths the same as stock Fuchs, and outer edges placed the same as stock 7 & 9 x16 Fuchs.

I can't wait, I have been wanting to go to 17" and larger tires for awhile. The thing is, I like the "old-school" look of the Fuchs. This solves the problem ata reaosnable $$$.

I was going to keep my 16" wheels (probably just get dusty), but my friend is chomping at the bit to buy my 16" Fuchs as soon as I upgrade.

Let me know if the rsr set makes it to production ill prepay, Kevin stew09@aol.com

i hope you do the rsr rears without the need for spacers, most of us narrow car guys that did wide bodies would like to get ride of any spacers, Kevin