when did fuchs change from deep 6 to flat
 

Hi all,

Does anyone know when fuchs changed from deep 6 to flat 6 style. I know its within 1970 and I know there must be a cross over period, but is there a confirmed/exact date available.

I have a RHD 1970 911S
Vin - 9110301252

and wondered what wheels it original had.

Thanks

Alan.UK

1971 model year was deep, 1972 was flat.

There was another important change. The ’72 added a “safety bump” to the rim to help maintain the tire bead seating on the rim under hard cornering side loads.

Best,
Grady

I think the change happend mid way through 71. Some 71s came with deeps, some came with lates.
Either way, your 70 should have deeps.

dvkk,

My recollection is that the first factory delivered 911s with the later wheels were actual ’72 models (oil flap). Yes, I’m sure some ’71 models got the new ’72 wheels as dealer upgrades from ’71 5 ½ x 14 Fuchs and 5 ½ x 15 painted or chrome. Of course in the intervening years much could have happened.

I agree, Alan.UK’s late 1970 911S originally came with the early 6x15.

Best,
Grady

what is the adv. or disadv. of the deep wheels?

no advantage to either except that the later wheels have the safety beads. Th eVW guys prefer the early wheels for the deep dish appearence.

I've heard that it was midway through 71' as well but don't know the exact date.

Ideally car makers like to make changes in respect to year models but if they have an "improved part" they'll start using it instead of re-ordering an out-dated version.

Likewise if they have a stock pile of a certain part they will use that supply before they start using the replacement version.

Thanks guys, looks like I need to get my deep 6s restored for my 70S.

Alan.UK

Per the factory service manual, Vol. I ... 24 March 1971 was the effective date of the wheel change ...

To expose my ignorance, how do you tell the difference, is it just a deeper dish to the wheel? Can you check the part number to tell? I checked mine a while back, and they're a 6J 15, but that's as far as I went, they do seem to have a dish to them.

Matt beat me to asking that question.

Can someone go a little more novice and explain any other differences between different types of Fuchs/replicas. I started out thinking that all 15x7 or whatever were the same, then I read about offsets, now I hear about deep dish. Finally, I have looked at my own wheels and notice they are different than others I have seen.

So, is the dish the amount of inset between the outside rim and the rest of the wheel, or is it how dished the inner portion is? I have what I believe are replicas on my car (15 x7), but the plane of the wheel (the pedals or whatever they are called) are really inset compared with the rim. Is this desireable, not desireable, etc.

Thanks, I'm really confused now...

The offset is the same on deep and late 6's. The petals on the deep 6 arch back toward the rear of the wheel when they get to the rim. This makes the rim look deeper. The late 6's are more of a flat two-diminsional wheel where the petals are flat on the face of the wheel and intersect the rim at rigt angles. Hard to describe really.
The deep 6s have a 901 part # and the late 6's have a 911 part #

I went to the garage and took a quick pic to show the difference. The deep 6 is on the left
http://forums.pelicanparts.com/uploa...1079281365.jpg

This is a picture of an 6x15 deep dish fuchs.
http://forums.pelicanparts.com/uploa...1079281519.jpg

The problem with this, or so I am told is, that it is a bad idea to run this rim with a tubeless tyre. It has no safety bead keeping the tyre on the rim.

http://forums.pelicanparts.com/uploa...1079281693.jpg

This is a later style 6x15 fuchs with a shallow dish:
http://forums.pelicanparts.com/uploa...1079281659.jpg

Finally this is a picture of an deep dish 7x15 rim. As you can see it is very similar to a deep dish 6x15. Only difference is a different offset as the 6x15 and enables you to run wider tyres without rubbing the fenders. These are generally very sought after.

http://forums.pelicanparts.com/uploa...1079281809.jpg

Thank you everyone. I think I'm beginning to understand.

And for what it is worth, I still need one 15x6 deep Fuch to make a set. Anyone got a unrestored spare laying around?

As for the advantage of both types, I was told by Mr Weidman (Weidman wheels) that the safety bead has nothing to do with tubes. The safety bead is to prevent the tire from moving towards the center of the wheel in the event of rapid deflation. The bead makes it more likely that the tire will remain on the wheel in the event of a flat. He said that there is no reason to use a tube on a deep six. Note that tires made to be used without tubes don't like to have tubes installed within them, as the tube alters the way that the tire deals with heat. The advantage to late 6s is that the profile of the wheel between the rims makes it much easier to install tires. Early 6s are tough to mount tires to. In addition, early 6s have very large valve stem holes. Sometimes you have to dig to finds the right valve stems.

The part # for the deep six Fuchs is 901.361.012.06

This is all great info, thanks all.

Another quick question then while we are on this thread, when did the flat style 6 x 15 with the 3 pin centre cap change to the later 6 x 15 with the larger centre cap ie the ring type centre cap.


Alan.UK

@Scott Clarke,

At least in Germany, but probably some other EU countries it is not allowed to:
use tubes in tubeless tires
use tubes in 65 or lower series tires

Also Porsche specified in one of its tech. info sheets that fundamentally may not be used on single hump rims

http://home.arcor.de/s-g-e/radga.htm (in german)

This is a bit of a problem as the only tube type tires with adequate speed rating are a bit on the expensive site. I opted to buy the later type rims as I realy do not want to take any chances with safety related parts.