1971 911 Wheels and Tires

[stcan]

Hi,

I have narrow down to couple of choices for wheels and tires for the 1971 911 stock flare.

I have some questions.

6x15ET36 front, 7x15ET23.3 rear VS 7x15ET23.3 all around. Will the 7x15ET23.3 stick out too much in the front and don't look as nice? Which option is better?

Will there be performance differences by going with 6x15 vs 7x15?

I am planing on using 205/55 15 for all tires 6" and 7"

In that size anyone familiar with Direzza DZ102 vs Advan Flea V701 tires?

The car will be have SC engine upgraded to 3.5L making around 350HP

Thanks

[Bill Verburg]

Originally Posted by stcan

Hi,

I have narrow down to couple of choices for wheels and tires for the 1971 911 stock flare.

I have some questions.

6x15ET36 front, 7x15ET23.3 rear VS 7x15ET23.3 all around. Will the 7x15ET23.3 stick out too much in the front and don't look as nice? Which option is better?

Will there be performance differences by going with 6x15 vs 7x15?

I am planing on using 205/55 15 for all tires 6" and 7"

In that size anyone familiar with Direzza DZ102 vs Advan Flea V701 tires?

The car will be have SC engine upgraded to 3.5L making around 350HP

Thanks

4x 6ET36 x15, 6ET36 x15 front & 7ET23.3 x15 rear or 4 x7ET23.3 x15 all work

which to use depends on what you want from the setup

The basic handling characteristics of the car come from the slip angles that the tire runs at front and rear, alignment also affects this

when there is a larger slip angle in front the car oversteers

when there is a larger slip angle in back the car understeers

The tire manufacture's control the foundation stiffness that is the basis for a given tires slip angles

you can alter that w/ sizing choice of both the wheel and tire and suspension alignment(ride height, camber & caster)

of the 2 tires you mention the Yoko is going to be a better gripping tire

call 6x16 w/ 195/65 x15 tires the base setup

changing to 6 front and 7 rear increases grip (lowers the slip angle) in back and reduces oversteer, even w/ the same 195/65 tires

adding stagger by changing the rear tires to 205/60 further increases rear grip (lowers the slip angle) and further reduces oversteer

going to 4x 7ET23.3 w/ 205/55(which fits fine) leaves the basic handling traits the same but does raise the overall grip level

[SalazarS2K]

Whatever option you select, can you post some pictures of your skinny monster?

[dwelle]

6 and 7's staggered with 205/55-15 yoko Sdrives all around, now running the V701's on the back:



another pic with 7's front and back with the same tires:



personally not a fan of 7's all around on the narrow cars, i think the staggered look really works better. the 7's stick out too much for my tastes. i've been happy with the yoko's, great tire for a car i drive all the time. the 50 series tires put both the car and the gearing too low for my tastes in a daily driver.

i have a pair of 6 & 7" steelies i'm going to try the DZ102's on in a 205, we'll see...

[stcan]

The monster is all stripped down.

I like the 4x7ET23.3 but afraid that the front will stick out too much. Dwelle, do you have more picture of your front with 7" from different angle?

The problem with 6ET23.3 Front and 7ET36 Rear is that you can't get the wheel profile to match. Most 6" Fuchs are the old style Flat or Deep 6. And the 7ET36 Fuchs are newer style 74+ with step lip look. Unless it's the 7ET49 7R wheel, but than I would need large spacer to bring it back out.

Will using 205/55-15 on the 6ET36" make it 1" less wide than 205/55-15 on 7ET23.3?

The other option I could do is 4x7ET23.3 with 195/55-15 front and 205/50-15. What do you think of that?

[Bill Verburg]

The problem with 6ET23.3 Front and 7ET36 Rear is that you can't get the wheel profile to match. Most 6" Fuchs are the old style Flat or Deep 6. And the 7ET36 Fuchs are newer style 74+ with step lip look. Unless it's the 7ET49 7R wheel, but than I would need large spacer to bring it back out.

The 7 205 moves the outer edge out a bit less than an inch compared to the 6 185


good new is 4x 7 205/55 gets you an extra 19lb-ft of torque, this is significant

[dwelle]

this is all i have. i put the 6's on the passenger side and 7's on the driver's a while back as i briefly considered running 7's all around. didn't like either.

the V701 replaced the Sdrive which i have in these pics. very similar tire, i acutally run the V701 on the rear now...

[stcan]

Originally Posted by Bill Verburg

The 7 205 moves the outer edge out a bit less than an inch compared to the 6 185


good new is 4x 7 205/55 gets you an extra 19lb-ft of torque, this is significant

Bill, in your opinion, which option do you think is the best

1) 6ET36x15 front with 205/55-15 front and 7ET23.3x15 Rear with 205/55-15. Would that stick out 1" less than if I were to do 7ET23.3x15 with 205/55/15 front

2) 6ET36x15 front with 195-55-15 and 7ET23.3x15 Rear with 205/50-15

3) 4x7ET23.3 with 195/55-15 front and 205/50-15 Rear

4) 4x7ET23.3 with 205/55-15 around around

Also, is the wheel and tire fitment for the stock front of the 71 911 the same as stock front fitment for 88 911? I want to do test fitment on my 88 since my 71 is all taken apart. Will they be pretty close?

Thanks again Bill

[stcan]

Originally Posted by dwelle

this is all i have. i put the 6's on the passenger side and 7's on the driver's a while back as i briefly considered running 7's all around. didn't like either.

the V701 replaced the Sdrive which i have in these pics. very similar tire, i acutally run the V701 on the rear now...

Thanks for the picture Dwelle,

What camber are you running at the front?

[Larmo63]

350 HP?

Engine specs? Sounds really fun and expensive.

[Bill Verburg]

Originally Posted by stcan

Bill, in your opinion, which option do you think is the best

1) 6ET36x15 front with 205/55-15 front and 7ET23.3x15 Rear with 205/55-15. Would that stick out 1" less than if I were to do 7ET23.3x15 with 205/55/15 front

2) 6ET36x15 front with 195-55-15 and 7ET23.3x15 Rear with 205/50-15

3) 4x7ET23.3 with 195/55-15 front and 205/50-15 Rear

4) 4x7ET23.3 with 205/55-15 around around

Also, is the wheel and tire fitment for the stock front of the 71 911 the same as stock front fitment for 88 911? I want to do test fitment on my 88 since my 71 is all taken apart. Will they be pretty close?

Thanks again Bill

a lot depends on tire availability and looks, some folks just don't like the optics of low profile tires despite the advantages
for a stockish n/b, either 4x6 195/60 or 195/55 is fine, 4x7 w/ the same tires adds balanced grip

4x7 205/55 or 205/50 adds more balanced grip

4x7 205/50 & 225/50 adds more grip in back and is more appropriate for a more potent motor

4x7 205/50 & 2225/45 is an amplification of that

if you were willing to get custom width and ET 15s 7 & 8 is doable w/ up to 225/45 front and 225/45 rear on a n/b

[dwelle]

Originally Posted by stcan

Thanks for the picture Dwelle,

What camber are you running at the front?

just over 1° in front and 2° in back...

[stcan]

Originally Posted by Bill Verburg

a lot depends on tire availability and looks, some folks just don't like the optics of low profile tires despite the advantages
for a stockish n/b, either 4x6 195/60 or 195/55 is fine, 4x7 w/ the same tires adds balanced grip

4x7 205/55 or 205/50 adds more balanced grip

4x7 205/50 & 225/50 adds more grip in back and is more appropriate for a more potent motor

4x7 205/50 & 2225/45 is an amplification of that

if you were willing to get custom width and ET 15s 7 & 8, or 7 & 9 or 8 & 9 or 8 & 9.5 are all doable w/ up to 225/45 front and 245/40 rear on a n/b

If I am going custom. What is the ideal size wheel and offset would you recommend and the tire size?

[Bill Verburg]

Originally Posted by stcan

If I am going custom. What is the ideal size wheel and offset would you recommend and the tire size?

I actually got carried away a bit in the last post , theoretically there is ~9.5" of room in back so a 9 245/40 x15 could be fitted but in practice I'd limit it to 8 225

front 7ET25-26 w/ a 205/50 or 8 ET27-29 225/50

and

rear 8ET28-32 rear 225/50 or 8.5ET30-34 225/50 or /45

[stcan]

Originally Posted by Bill Verburg

I actually got carried away a bit in the last post , theoretically there is ~9.5" of room in back so a 9 245/40 x15 could be fitted but in practice I'd limit it to 8 225

front 7ET25-26 w/ a 205/50 or 8 ET27-29 225/50

and

rear 8ET28-32 rear 225/50 or 8.5ET30-34 225/50 or /45

Spoke to Brant at Fikse. They can do 15 custom Fuchs now.

He was suggesting 4 x 7ET29. He said 8 doesn't fit well in the back. But I thought that might bring the rear in too much.

Does it make sense if I was to do

Front 7ET29 and Rear 7.5 ET25 That way I can run 4 x 205/55/15
or
205 50/15 front and 225/50 15 or 225/45/15 rear

As the 7.5 in the back would work for both 205 or 225 rear.

And I am planing on using KW V3 strut/shock with raised spindle. That might be problem fit fitment too right?

https://www.rsrproducts.com/product-page/kw-suspension-kit-69-89-w-raised-spindle