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I’m pretty sure 16x8 won’t fit well at the rear of NB.
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Old 08-25-2019, 02:58 PM
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This setup looks great! More tire means more grip and it looks nice. If it's too much just run 15x7's with 205's all the way around.

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Originally Posted by 75 911s View Post
I like the splitting the 8" wheel and moving the 1" inside idea as described by CBA above.

I also run a 225/50 15 on my narrow body on a 15X7 Maxilite 7R style wheel (49 ET with 18mm spacer) It requires longer wheel studs (72mm)

Old 08-25-2019, 03:38 PM
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I've got some 215 Avon CRZ6 and they're awesome on a 7R offset wheel in the rear. Thats all the tire I could fit with the elephant oil lines on the passenger side. My 3.2 doesn't need anymore rubber than that to be honest.
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Old 08-25-2019, 04:13 PM
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Originally Posted by jac1976 View Post
I’m pretty sure 16x8 won’t fit well at the rear of NB.
a 16 x 8 from a 951 will as the offset brings the wheel in further. with a fair bit of negative camber a 225 will fit, but there is no guarantee it won't rub up inside the quarter panel. every car is different, i've seen it work and also seen it rub from guys who have done it. i bought a full set of 951 7' & 8" fuchs for my green car years ago, but they ended up on my 914 after i realized i didn't need or want 225's in back.

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Originally Posted by dg567 View Post
I've got some 215 Avon CRZ6 and they're awesome on a 7R offset wheel in the rear. Thats all the tire I could fit with the elephant oil lines on the passenger side. My 3.2 doesn't need anymore rubber than that to be honest.
those tires are awesome, but they're really tall. many like the lowered gearing/better acceleration from a 55 or 50 series tire. the avon's would be awesome with big torque/HP, and they look great...
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Old 08-25-2019, 05:19 PM
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16X8 on a n/b midyear

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Old 08-25-2019, 05:21 PM
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“Well” is the operative word.
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Old 08-25-2019, 05:27 PM
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Quote:
Originally Posted by dwelle View Post
a 16 x 8 from a 951 will as the offset brings the wheel in further. with a fair bit of negative camber a 225 will fit, but there is no guarantee it won't rub up inside the quarter panel. every car is different, i've seen it work and also seen it rub from guys who have done it. i bought a full set of 951 7' & 8" fuchs for my green car years ago, but they ended up on my 914 after i realized i didn't need or want 225's in back.



those tires are awesome, but they're really tall. many like the lowered gearing/better acceleration from a 55 or 50 series tire. the avon's would be awesome with big torque/HP, and they look great...
The 215/60s are 25in tall - not super tall imo what are you running on the 3.2 backdate?
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Old 08-25-2019, 06:33 PM
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The 215/60s are 25in tall - not super tall imo what are you running on the 3.2 backdate?
205/55. they run a little under 24”. i tried RE-71’s in a 205/50 when i finished that build, but i had to lower the car too much to be able to drive it every day. those we just over 23” tall. the gearing with those was too low at highway speeds for my tastes.

my car had 215/60’s on the back when i bought it, the 55’s are a nice compromise for my tastes. i have considered running the avons.

i’m not sure i would enjoy a 25” tire with less HP/torque than i have with the 3.2...
Old 08-26-2019, 06:59 AM
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imho, the 911R offset wheel looks best under the narrow body fender. Like "75 911s" above, my folks ran 6x15 front, 7x15 911R wheels in back on their '74 911S with longer studs and spacers. 205/50 front, 225/50 rear. Nice stance. period correct.

Can you squeeze a 951 8x16? yes.. but imho, doesn't look right and you may not get more than a 225 on it anyway. The narrow body cars really don't like more than a 7" wheel. If you want wider, you need SC/RS/Carrera read flares grafted on.
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Old 08-26-2019, 07:38 AM
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imho, the 911R offset wheel looks best under the narrow body fender. Like "75 911s" above, my folks ran 6x15 front, 7x15 911R wheels in back on their '74 911S with longer studs and spacers. 205/50 front, 225/50 rear. Nice stance. period correct.

Can you squeeze a 951 8x16? yes.. but imho, doesn't look right and you may not get more than a 225 on it anyway. The narrow body cars really don't like more than a 7" wheel. If you want wider, you need SC/RS/Carrera read flares grafted on.
I tend to agree with this. I will attempt 15x7 (not the 911R, however) with appropriate camber on the rear of my 1977 NB.
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Old 08-26-2019, 07:47 AM
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i agree. in my experience, the 7” wheel in back with a 205 and a dose of negative camber is the sweet spot...
Old 08-26-2019, 08:10 AM
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Yep, my second set will be a 205/50 on a regular offset (23ET) 7" in back. Fits great. 205/55 or 195/60 in a 15" are available readily. I don't mind the 205/50 gearing wise. It's a 23.1" tall tire. Looks good if your car is race track low. I can do long drives and it's fine in 5th gear at 3k plus depending on speed.
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Old 08-26-2019, 09:25 AM
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Yep, my second set will be a 205/50 on a regular offset (23ET) 7" in back. Fits great. 205/55 or 195/60 in a 15" are available readily. I don't mind the 205/50 gearing wise. It's a 23.1" tall tire. Looks good if your car is race track low. I can do long drives and it's fine in 5th gear at 3k plus depending on speed.
how is that? with the 55's i'm close to 4K doing 80 in 5th gear. i'm not even going the speed limit at 3K...
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Old 08-26-2019, 10:28 AM
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74 and 75+ had a different final gearing. 74 had 7.31 R&P while the 75+ had a 8.3? cant recall precisely. Better accel with the '74. Better mileage with the 75+
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Last edited by racer; 08-26-2019 at 10:44 AM..
Old 08-26-2019, 10:42 AM
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right. if i'm not mistaken, both duane and i should have the same gearing at 8:31. if his gear sets haven't been modified, even our gears should be the same.

whenever i have to crack my gearbox for service, i'm really tempted to put a taller 5th gear in. i'd like my RPM's to drop, 3500 at 80 mph would be nice...
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Old 08-26-2019, 01:47 PM
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Yeah dwelle is correct in that we have the same ratio. Mine is 8:31 and a 915/40. Are you speaking of your 74 or your 76? If I recall, SOME of the 74 had the 8:31. Not all had the 7:31 which I've heard is a bit more desirable.
In the words of the great Grady Clay:

"A 915/40 is a 1975 5-speed 911S, 911S/C (USA). If as originally delivered its gearing is:
1st – 11:35
2nd – 18:33
3rd – 23:29
4th – 26:26
5th – 28:23
R&P – 8:31

It should have a serial number in the form:
715XXXX starting with 7150001

Best,
Grady"

I take a closer look at different speeds in 5th and report back.
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Last edited by 75 911s; 08-26-2019 at 02:31 PM..
Old 08-26-2019, 02:28 PM
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speaking of the ‘76, it has 8:31 R&P.

ironically, my ‘74 has a 915/40 in it...
Old 08-26-2019, 04:17 PM
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great car, great color —*congrats, im waiting for the day i can get a narrow body as well.

dont mean to hijack this thread but your guys' tire fitment convo is very relevant to me rn, albeit in the reverse way: im trying to figure out how to make some 15x7's work on my lowered '85 and want to get as close to it's current look/feel on the 16x7/8, 205-55/225-50 setup.

1. is running a square setup on a g-body OK? im assuming not on track during the summer but maybe on weekend daytrips during colder months are OK? could at least be my winter all-season tires look.


2. what tire size would feel and look most similar to the 16's? 205-55/15? 205-60/15? my thought is to then space the rear out to fill the well.

3. alternatively, and more challenging to find, i could try to put staggered tire sizes on the square wheels to at least mimic the standard rubber balance F/R for handling characteristics?

any thoughts/photos would be super helpful.

if this is the wrong place to do this please let me know but again, u guys seem very knowledgeable, thanks.

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Old 09-03-2019, 04:36 AM
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great car, great color —*congrats, im waiting for the day i can get a narrow body as well.

dont mean to hijack this thread but your guys' tire fitment convo is very relevant to me rn, albeit in the reverse way: im trying to figure out how to make some 15x7's work on my lowered '85 and want to get as close to it's current look/feel on the 16x7/8, 205-55/225-50 setup.

1. is running a square setup on a g-body OK? im assuming not on track during the summer but maybe on weekend daytrips during colder months are OK? could at least be my winter all-season tires look.


2. what tire size would feel and look most similar to the 16's? 205-55/15? 205-60/15? my thought is to then space the rear out to fill the well.

3. alternatively, and more challenging to find, i could try to put staggered tire sizes on the square wheels to at least mimic the standard rubber balance F/R for handling characteristics?

any thoughts/photos would be super helpful.

if this is the wrong place to do this please let me know but again, u guys seem very knowledgeable, thanks.

iirc, '85 came 15" wheels. I think 7x15 front, 8x15 rear. SC's had the same body and would have had either 6x15 and 7x15 or optional 7/8 x 15s (and yes, 16"s too). Stock sizes were 195/65-15 and 215/60-15 for the Carrera, SC may have still had 185/70 and 215/60.

You would want to run spacer or adaptors to fill out the fenders. Depending on the size of the spacer, you may need longer studs.

Porsche went to a staggered set up to help the rear stay planted (and keep the lawyers happy). If you are a competant driver and not afraid of oversteer (throttle or lift off) a squared set up can be fun. I know folks who used to run 225/50 squared for AX with success.
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Old 09-03-2019, 05:07 AM
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