This time, it will be an article on how to properly install the wheels on our air-cooled Porsche 911 (964 model), which is something of a maniac.
For those of you who have had air-cooled Porsches for years, you may be thinking, "I don't know what you're talking about.This may sound like a "one-size-fits-all" approach, but it is also an introduction to Porsche's commitment to "driving".

Stock and anti-theft nuts for Porsche wheels

The genuine Porsche nut (part no. 99918200336) used for 964 and other models is made of aluminum and is very light.
It weighs an astonishingly light 18 grams.When I actually held it in my hand, it was so light that I could not imagine from its rugged metal nut that it was made of reinforced plastic or something. It is so light that you would think it was made of reinforced plastic or something.

Light weight of only about 18g

On the other hand, there is another type of nut, the genuine anti-theft (lock-up) nut (part no. 92836104703).
This one is structured so that the bolt cannot be turned without a special key, and consists of three parts: the bolt itself, a cover with a keyhole, and a cap. These parts are also light for their size, weighing only about 49g.

Since the 964 is a 5-hole wheel, it uses a total of five nuts: four regular nuts and one anti-theft nut, but having only one anti-theft bolt is not a good look.
So I decided not to use the anti-theft bolts and bought four regular bolts to replace them, but I wondered if the 31g difference, no matter how lightweight the bolts are and how much they are inside the tire, would affect the wheel balance. So I decided to look into the matter this time.

Thus, the anti-theft bolts are large and stick out and stand out somewhat.

Porsche has specified a position for the use of heavy anti-theft bolts.

The 964's instruction manual reads as follows.

When installing wheels, make sure the wheel bolt identified in the paint is farthest from the valve. Always install the lock-up wheel nut on the wheel bolt identified in the paint.

What is "Paint Identified Wheel Bolt"?So I actually looked at it and found that on my 964, there is a bolt that is painted in fluorescent color. It says that the air valve should be located farthest from the position of this bolt and that the anti-theft bolt should be attached to that painted bolt.

In other words, it would look something like the diagram below.

There is one painted bolt.

Porsche has specified these bolts so strictly in order to minimize the effect of wheel balance due to differences in these bolts.

If you are concerned about wheel balance on an air-cooled Porsche, you need to check

Our 964 was originally installed correctly and the wheel itself is well balanced, so there is no particular problem,If you are concerned about wheel balance deviations, you can check to see if the mounting position is as specified hereI think.

If the tires are being removed and installed by a Porsche dealer or specialty store, it is first of all a non-issue, but if not, such as a general tire shop, it is conceivable that this may not be the case.

By the way, I have tried to stop using anti-theft bolts and try everything with regular bolts and vice versa, and here is what I think of them.

• Front looks smoother with normal bolt-only instead of anti-theft bolt.
• Rear looks smoother with anti-theft bolts.

The difference was quite noticeable. However, since I have my wheels balanced very strictly, I could not feel any noticeable difference, but it was interesting to see the subtle change in the smoothness of the rolling sensation.

Why don't you take this opportunity to reconfirm the wheel position of your car?