15x8 Fuchs ofset info

[ditch68]

Guys - I have rear 15x8 Fuchs, one is bent. Well, I don't think the rears are original Fuchs. So I want to replace them.

My car has SC fenders, so I have a little more room in the wells, I think I can get 9s in there, if they are offset to the inside. I have no room outward. Also, oddly, the driver's side is farther outboard than the passenger - not the rims, the whole trailing arm, brakes, etc. It is a 912 with Nadella axles.

How are Fuchs offsets incremented? I know in millimeters, if I want all of the extra inch of width to be to the inside, how is that expressed in the rim size?

Anyone have a set of cosmetically challenged (but not bent) 15x9s with this offset?

Sorry for the ignorance, I'm still learning "Porshe".



Jeff

[Bill Verburg]

Originally Posted by ditch68

Guys - I have rear 15x8 Fuchs, one is bent. Well, I don't think the rears are original Fuchs. So I want to replace them.

My car has SC fenders, so I have a little more room in the wells, I think I can get 9s in there, if they are offset to the inside. I have no room outward. Also, oddly, the driver's side is farther outboard than the passenger - not the rims, the whole trailing arm, brakes, etc. It is a 912 with Nadella axles.

How are Fuchs offsets incremented? I know in millimeters, if I want all of the extra inch of width to be to the inside, how is that expressed in the rim size?

Anyone have a set of cosmetically challenged (but not bent) 15x9s with this offset?

Sorry for the ignorance, I'm still learning "Porsche".


Jeff

All 8x15 Fuchs are ET10.6 and will only fit properly in the back of a 911 w/ SC/Carrera flares

9x15 are going to be extremely rare. W/ SC/Carrera flares on a square chassis w/ the drivetrain centered, 9's will fit w/~ ET10 -15, the lower ET will sit outboard further the higher is what most people use(i.e. that is what the 9x16 930 Fuchs are)

in 16 there were 2 different 8s

1. 8x16 ET10.6 aka 911 8
2. 8x16 ET23.3 aka 944 8

As w/ the 15 the ET10.6 is best suited to the back of a car w/ SC/Carrera flares, the ET23.3 has been used front and rear even on narrow body cars but it's an extremely tight & finicky fitment(i.e. not recommended)

[88-diamondblue]

As Bill said the 9's are very rare and very expensive if you can find them, plus finding tires to fit is another thing. Be better off going to a 8 or 9 x16 on the rears which cost $1200-$1800 depending on condition. 15 x 9's Fuchs are well above that.

[ditch68]

Thanks for the excellent answers - that makes it easy. I'll likely stick with 15x8. Eventually I should go to 16 all the way around, if just for better tire availability.

Thanks, guys. Such a great forum.

Jeff

[runner4fun]

At the risk of asking what has been previously discussed and addressed, here I go. I have a recently refinished, never installed set of 15" Fuchs in 7" and 8" that I plan to install on a 1970 911T with RS rear flares. Per Bill V above, all 15x8 Fuchs have a 10.6ET and will fit a 911 w/ rear flares just fine.

My question is whether the 15"x 7" Fuchs I have will fit the front of the 911T. I've checked my 7" wheels and cannot seem to find the ET stamped on the back-side of the wheel. Sorry if this has been asked and answered before.

Finally, I have considered using 16" x 7" and 8" Fuchs as an alternative to the 15" Fuchs on the 911T due to the relative difficulty in finding 15" diameter tires these days. Any thoughts on that? I am hoping the answer is to use the 15" wheels as I have a perfect newly refinished set of 15" wheels and they are more period correct for the car.

thank you.

(Hoping Bill V. sees this post....)

[Bill Verburg]

Originally Posted by runner4fun

At the risk of asking what has been previously discussed and addressed, here I go. I have a recently refinished, never installed set of 15" Fuchs in 7" and 8" that I plan to install on a 1970 911T with RS rear flares. Per Bill V above, all 15x8 Fuchs have a 10.6ET and will fit a 911 w/ rear flares just fine.

My question is whether the 15"x 7" Fuchs I have will fit the front of the 911T. I've checked my 7" wheels and cannot seem to find the ET stamped on the back-side of the wheel. Sorry if this has been asked and answered before.

Finally, I have considered using 16" x 7" and 8" Fuchs as an alternative to the 15" Fuchs on the 911T due to the relative difficulty in finding 15" diameter tires these days. Any thoughts on that? I am hoping the answer is to use the 15" wheels as I have a perfect newly refinished set of 15" wheels and they are more period correct for the car.

thank you.

(Hoping Bill V. sees this post....)

7x15 Fuchs are all ET23.3 and fit fine on the front of all 911s as long as the tires are reasonably sized

one really nice set up as long as SC/Carrera flares are on the car is
7ET23.3 x15 w/ 205/50
8ET10.6 x15 w/ 225/50

911 16s have the same ETs as 15s ie 7ET23.3 and 8ET10.6, there are also 9444 16s which are 7ET23.3 w/ more brake clearance and 8ET23.3 which aren't a very good choice for either end of a 911

the issue w/ 16 is tire height which hurts performance and makes fitment more difficult

stock SC/Carrera used 16s w/ the following specs
6ET36 & 7ET23.3 w/ 205/55 & 225/50
a much better way to go iw/ 16s s 7ET23.3 205/50 & 8ET10.6 225/45

In between is the 7ET23.3 & 9ET15 w/ 205/55 & 245/45

if you go w/ either Fikse or Braid Fuchs clones 8ET27 w/ 225/45 and 9ET15 w/ 245/45 can be used, this is more of a track set up though

max is 8ET27 and 9.5ET19, but again be careful w/ tire choice i've seen up to 245 front and 275 rear

[runner4fun]

Thank you Bill. Much appreciated.

My confusion was that my 7" wheels have Porsche part no. 911-361-020-41. The part no. I found for the 7" wheels that came from the factory on a 1973 RS was 911-361-020-11. But after researching it, I found that they are apparently the same wheel with just different numbering as a function of later year 911's.

As I said I bought a set pf 15" Fuchs that the seller had refinished beautifully and never installed. I'd like to use those on my 911T as they are period correct and very nice. But I read a lot about how difficult it is to find 15" tires these days. I have 16 x 7 and 8 on my 85 Carrera and have no trouble finding tires for that car.

It's the worry of not finding 15" tires to fit that is the concern.

[Bill Verburg]

Originally Posted by runner4fun

Thank you Bill. Much appreciated.

My confusion was that my 7" wheels have Porsche part no. 911-361-020-41. The part no. I found for the 7" wheels that came from the factory on a 1973 RS was 911-361-020-11. But after researching it, I found that they are apparently the same wheel with just different numbering as a function of later year 911's.

As I said I bought a set pf 15" Fuchs that the seller had refinished beautifully and never installed. I'd like to use those on my 911T as they are period correct and very nice. But I read a lot about how difficult it is to find 15" tires these days. I have 16 x 7 and 8 on my 85 Carrera and have no trouble finding tires for that car.

It's the worry of not finding 15" tires to fit that is the concern.

It all depends on which specific tires you want

for a 911t you can use 7ET23.3 all around but you want to keep the toire OD down

Tire OD for a 911t was ~25.2"(185/70 x15) that is too tall and too wide for a 7

on a 7 you want 205/55 @~23.8" OD , some go w/ a shorter tire lie 205/50 or a taller like 205/60 but both of these have their own possible issues, for some it's ok for others not so much

195/55 @~23.4 is another good choice for a 7

for 7 & 8 x15
A052, A048,RA1, R888, P7 classic, P Zero Trofeo, all are high perf or track oriented

[runner4fun]

Thanks Bill. As always, extremely helpful.

[runner4fun]

Reviving this thread at the risk of beating a dead horse. I have a 1973 911T that I am going to restore and turn into a mild RS style hot rod. I have a set of 15" x 7" and 8" Fuchs for the car that I was planning to use (and may still use).

But i also have the set of 16" x 6" and 7" Fuchs that i removed from my 1985 911 Carrera. I see that the original 1973 RS came with 15" x 6" and 7" wheels (with spacers, i believe).

So, now I am wondering if my 16" Fuchs might be a better wheel choice for the 911T than the set of 15" that i have. Any thoughts would be appreciated. Thanks

[panzerfaust]

Plenty of folks run with factory 8 and 9x16 Fuchs on Sc/3.2 cars. 8s are from the 951 with higher ET’s used on the fronts

[Tremelune]

[Bill Verburg]

Originally Posted by runner4fun

Reviving this thread at the risk of beating a dead horse. I have a 1973 911T that I am going to restore and turn into a mild RS style hot rod. I have a set of 15" x 7" and 8" Fuchs for the car that I was planning to use (and may still use).

But i also have the set of 16" x 6" and 7" Fuchs that i removed from my 1985 911 Carrera. I see that the original 1973 RS came with 15" x 6" and 7" wheels (with spacers, i believe).

So, now I am wondering if my 16" Fuchs might be a better wheel choice for the 911T than the set of 15" that i have. Any thoughts would be appreciated. Thanks

Here's a summary of what fits and what is available for an SC/Carrera chassis 911, w/i a group lower is generally better and right is generally better for performance on a given line.
Going down between groups will yield mixed results some times better sometimes worse but generally shorter tire OD and shorter side wall will yield better performance


Yes, an original '73 RS used 6ET36 & 7ET23.3 x15 w/ 185/70 and 215/60 tires that's the top row and yes they used spacers (i'd need to look the size up)

yes, 7Et23.3 and 8ET10.6 x15 can also be used, that was what my C3 came w/ on 205/50 & 225/50 tires( row 2 left side)

For performance use, the latter is preferred because of additional grip and far lower torque costs(~35 to 45 lb-ft depending on specific details)

similarly 7ET23,3 and 8ET10.6 x16 can be used w/ 205/55 & 225/50 tires( entry 7 left) here the same considerations make the 15s more desirable and again up to ~40lb-ft+/- difference can be seen w/ the edge going to the 15s

Not everyone makes decisions based on performance, some prefer looks and here the taller wheel/tire set often is preferred

[rosenbergendo]

Here is 7X8 on modest flares with 205 15VR 15 and 225 50VR 15 rear.

[runner4fun]

Thanks for the replies. I think I will stay with my original plan and go with the 15" x 7" and 8" Fuchs. Period correct and better performance. Also, from the appearance of rosenbergendo's car, they look great with the proper ride height. (Do you have spacers on those wheels?)

[Bill Verburg]

Originally Posted by runner4fun

Thanks for the replies. I think I will stay with my original plan and go with the 15" x 7" and 8" Fuchs. Period correct and better performance. Also, from the appearance of rosenbergendo's car, they look great with the proper ride height. (Do you have spacers on those wheels?)

no spacers are necessary w/ 7 & 8

205/50 on a 7ET23.3 has a front space of ~87mm max is ~89mm

225/50 on 8ET10.6 has a front space of ~109mm max is ~114mm so you could use a 5mm spacer but it'd likely lead to a bit bigger install headache

[runner4fun]

Thanks Bill. Much appreciated.

[944boost]

Originally Posted by runner4fun

Thanks Bill. Much appreciated.

Does anyone know Jeff ditch68? I bought his old car a year ago and would more info on it
Thanks