Tire choices for a 77 911 narrow body. CN36, avons?

[jakg104]

Hi folks,
Working on getting tires for my 77 911 narrow body with a 3.2 motronic engine. Car sits on 6x15 and 7x15 fuchs. Car came with a square setup for tires- 205 60 15 Falkens.

Ideally I'd like to get period correct tires that are in the 25" height so it fills in the wheel well, but cannot find good brands with sizes.

I'm thinking ideally 195 60 Front, 205 55 rear, or 185 70 Front, 215 60 rear. I do see Pirelli P6000, but nothing else..

Thoughts on other tire size combinations and brands that could potentially work?

@bill verburg would love to hear from you as well!

Happy Thanksgiving!
Jake

[Bill Verburg]

Originally Posted by jakg104

Hi folks,
Working on getting tires for my 77 911 narrow body with a 3.2 motronic engine. Car sits on 6x15 and 7x15 fuchs. Car came with a square setup for tires- 205 60 15 Falkens.

Ideally I'd like to get period correct tires that are in the 25" height so it fills in the wheel well, but cannot find good brands with sizes.

I'm thinking ideally 195 60 Front, 205 55 rear, or 185 70 Front, 215 60 rear. I do see Pirelli P6000, but nothing else..

Thoughts on other tire size combinations and brands that could potentially work?

@bill verburg would love to hear from you as well!

Happy Thanksgiving!
Jake

215/60 on a 7 will be problematic unless the wheel has an o/s in the 25-29 rarnge

7 ET23.3 will rub on full compression a couple of inches above the lip, so ET that moves the wheel in a few mm is what is needed.


The other tires are short enough to not be a problem

lastly watch the f/r tire height, you really want to keep them relatively close to being the same

[Mr. Merk]

The RS spec sizes of CN36 seem like a no brainer to me, assuming the offset is correct. May be able to dial in the negative camber to keep from rubbing under full compression.

We have these on a 75 Carrera with 7s & 8s. So good.

[Bill Verburg]

Originally Posted by Mr. Merk

The RS spec sizes of CN36 seem like a no brainer to me, assuming the offset is correct. May be able to dial in the negative camber to keep from rubbing under full compression.

We have these on a 75 Carrera with 7s & 8s. So good.

There's a big difference as to what works on a n/b and what works on an SC/Carrera body

also '73 - '75 RS spec was 6 & & x15 185/70 and 215/60, widest wheel specs for these sizes is 6 & 7.5", Though the factory did offer them on 7 & 8 in '75 & 76

[jakg104]

Originally Posted by Bill Verburg

215/60 on a 7 will be problematic unless the wheel has an o/s in the 25-29 rarnge

7 ET23.3 will rub on full compression a couple of inches above the lip, so ET that moves the wheel in a few mm is what is needed.


The other tires are short enough to not be a problem

lastly watch the f/r tire height, you really want to keep them relatively close to being the same

Ah! good point on the 215 not working in the rear... I'm tempted to go back with what the car has, the 206 60, but choices for a decent, period correct tire are a challenge..

[jakg104]

Originally Posted by Bill Verburg

There's a big difference as to what works on a n/b and what works on an SC/Carrera body

also '73 - '75 RS spec was 6 & & x15 185/70 and 215/60, widest wheel specs for these sizes is 6 & 7.5", Though the factory did offer them on 7 & 8 in '75 & 76

Mr. Merk, the issue will be that the RS/Carrera has wider rear flares, the narrow body is, well, narrow. Would have been easier if it was a Carrera flare car..

[Showdown]

215s will fit on 7” Fuchs in the rear. You’ll need between 1.5-2 degrees of negative camber and might need to roll your fenders, maybe not. All really depends on the tire profile but I had 215x15 Dunlop direzza on my narrow 1977 until I changed out to 6 x 15 wheels and taller tires for a more lively feel. Also Chicago potholes.


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[KMoore68]

Originally Posted by Showdown

215s will fit on 7” Fuchs in the rear. You’ll need between 1.5-2 degrees of negative camber and might need to roll your fenders, maybe not. All really depends on the tire profile but I had 215x15 Dunlop direzza on my narrow 1977 until I changed out to 6 x 15 wheels and taller tires for a more lively feel. Also Chicago potholes.


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What tires are you running now?

[Showdown]

I have 6x15 aluminum steelies form Group 4 and I have riken raptors 195x65

Fat meaty and a lot of fun. The Direzzas were too rough of a ride and made the car boring.

[mar2mar]

I'm currently using Pirelli CN36 215/60/15 at the rear of my 70S, and P6000 216/60/15 before that. CN36 has way better grip, smaller dimensions, looks better, and I think (but not sure) lighter as well. Wheels are Fuchs 7R.

[jakg104]

Originally Posted by mar2mar

I'm currently using Pirelli CN36 215/60/15 at the rear of my 70S, and P6000 216/60/15 before that. CN36 has way better grip, smaller dimensions, looks better, and I think (but not sure) lighter as well. Wheels are Fuchs 7R.

Looks great! Where are you buying the CN36 from?

[jakg104]

Originally Posted by Showdown

215s will fit on 7” Fuchs in the rear. You’ll need between 1.5-2 degrees of negative camber and might need to roll your fenders, maybe not. All really depends on the tire profile but I had 215x15 Dunlop direzza on my narrow 1977 until I changed out to 6 x 15 wheels and taller tires for a more lively feel. Also Chicago potholes.


Sent from my iPad using Tapatalk

Originally Posted by Showdown

I have 6x15 aluminum steelies form Group 4 and I have riken raptors 195x65

Fat meaty and a lot of fun. The Direzzas were too rough of a ride and made the car boring.

Man, i really want to avoid rolling the fenders. I prefer a lower(ed) look, so car will have some camber, but would prefer to not mess with fenders.
Great to hear about the Riken raptors...

[mar2mar]

Jakg104, I bought them at P Zero World in Los Angeles.

[blue72s]

Originally Posted by mar2mar

I'm currently using Pirelli CN36 215/60/15 at the rear of my 70S, and P6000 216/60/15 before that. CN36 has way better grip, smaller dimensions, looks better, and I think (but not sure) lighter as well. Wheels are Fuchs 7R.

mar2mar,
Looks good. What is the thickness of the spacer you're using? And how much negative camber?

[mar2mar]

Thanks blue72s, spacer is 5mm. Camber -1deg.

[jakg104]

Originally Posted by mar2mar

Jakg104, I bought them at P Zero World in Los Angeles.

Thanks! I’ll give them a call to see if they can ship to Texas.

[blue72s]

Originally Posted by mar2mar

spacer is 5mm. Camber -1deg.

mar2mar,

Thanks. Would you mind to take a picture like the one below to see how close your rear wheel & tyre (w/ 5mm spacer) is to the trailing arm?

[Bend911]

I have a 75 narrow body and struggled with tire choices as well. I know this doesn't help if you stay with 15" rims, but I went up to 16" Group4 wheels because 16" offered more tire choices. I also didn't want to roll my fenders so I went with 195/55/R16 (~24.4 in tire height) Bridgestone POTENZA RE-71RS. They were a fraction of the price of the Pirelli P4000, but again this isn't helpful if you want to stay period correct.

[mar2mar]

blue72s, with a 5 mm spacer the gap between toe adjustment bolt and tire is about 2.8mm. I’ll switch to a 7mm spacer, after taking the photo, It looks like there are tell tale signs that it lightly rubs on occasion.

[blue72s]

Originally Posted by mar2mar

blue72s, with a 5 mm spacer the gap between toe adjustment bolt and tire is about 2.8mm. I’ll switch to a 7mm spacer, after taking the photo, It looks like there are tell tale signs that it lightly rubs on occasion.

Woah! that is way too close. Good job I asked you to take a picture. I would use a 13mm spacer at the very minimum. Tyre sidewall can flex during cornering.
In fact, the factory Sports purposes manual (1968) recommends 27mm spacer.
.