Wheel spacers with stock studs

[Cattler]

I'm considering installing 10mm spacers to widen my track and bring the wheels out to fill the wheel well. Will 10mm spacers allow me to use the stock studs and still safely secure the wheel, or will I need longer studs? I have 16" wheels--I think 6 and 7s, but I'm going to check.

Thanks,
David

[Zeke]

I guess even an idiot has the ability to state the obvious, so I'll bite. You will lose 10mm of thread. In my old fashioned ways, that's over 3/4". Your call.

[cgarr]

I would replace the studs anything over a 1/4 inch spacer, your at 3/8. What you should really do that makes a difference you can see is install 7/8 spacers and get some 66mm studs.

[Zeke]

My bad. 3/8ths it is. Still, I would follow Craig's advice.

[Cattler]

Thanks...its been a long day.

[911st]

Anyone know if you go to steel lug nuts, which I believe are shorter, how much the threads stick out past the nut?

If this is the case, there may be a way to add a small spacer by going to the old style steel nuts.

I think some race organizations might even require the steelies.

[cgarr]

Try to keep 2 to 3 threads past the nut as a rule.

[chrisp]

steel lug nuts are a pretty much flush. There might be 1/2 to 1 full thread protruding but that's the way it's supposed to be. I think you'll find that with a 10mm spacer you'll be wishing you had more. You should be able to get the 21mm 930 spacer under there. Add 65mm studs and you're good to go.

[Zeke]

Well now let me tell you about what might be something to look into. My experience (which has not necessarily been validated by others) is that due to the configuration of the front hubs vs. the rear hubs (this works on early 911s) the fronts may be longer, but look the same length from the outside. If so, remove the fronts and transfer to the rear and buy longer ones for the front. Saves you 10 studs at 5 bucks each.

Let me know what you find by PM if you will because I've done this 2wice on early cars and it works if you only need something like 10mm more.

[GaryR]

Steel nuts or not, you need longer studs to be safe IMHO... add whatever the spacer is to the stock stud length and go from there..

[EarlySport]

My old rule of thumb was a minimum of the diameter of the bolt in engaged thread length. I think you'll be right at the limit with a 10mm spacer, and I'd go longer studs.

[Zeke]

Originally Posted by EarlySport

My old rule of thumb was a minimum of the diameter of the bolt in engaged thread length. I think you'll be right at the limit with a 10mm spacer, and I'd go longer studs.

Well, that would only be 1/2" of threads in the nut. I don't have one handy, and I have both steel and alloy around, but methinks the thread engagement is more like 3/4" before protruding on the steels or bottoming on the alloys.

[nameisbauer]

Just curious. In the talking about stud length, and needing new ones..

What is the actual length of a stock stud, front and rear. 911 SC exactly. I know I need longer ones, but don't know what they start at.

Our host offers 45, 52, 67, 72 and 100mm. What is stock so I know where to start adding.

thanks

[chrisp]

45mm

[nameisbauer]

Front and back?

thanks!

[Miguel Antonett]

Using steel nuts on steel studs you need to have, as a minimum, a thread engagement equal to the stud diameter.

[Chakka71]

Just posted a similar question and found what i'm wanting to know on this one. I guess I need to take some measurements and find out how much thread I need.
How much clearance should you have between the tire and my headers/exhaust. Looks like about 1" or so on the current wheel(225/45 16)