Wheel Studs? What should I know?

[78F350]

I just bought some wheel studs and spacers on eBay. What should I have known before I bought them?
-I am fairly certain that I want 20mm spacers for the particular wheel I have.
993.362.140.04 – 10Jx18 ET65 (Rear)
-I will probably be regularly swapping wheels between those and another set of stock 18s and 17s for street and track.

The studs I was not so sure of. They are 90mm and came with the spacers. As a set, I expect the length is good. What should I have looked for as far as material, length, and other specs?
Thanks.

[The Radium King]

from my limited experience, i can't comment on material and length (required to have a few turns of thread left after the nut is on). care and feeding is more than with bolts; install is finicky (getting them to proper torque using the rennline method of setting two nuts against each other is tough) they can loosen (use locktite) and have a rep for occasionally breaking.

[alm001]

I did 63mm studs all around, and I'll most likely have to go with longer studs in the rear if I wanted to run anything more than 10mm spacers. You should be good with 90mm.

[JayG]

Those studs should be fine with 20mm spacers. I have a similar set on my car and run 20mm spacers on the front.

The important thing is you have threads beyond the nut when tightened at at least the diameter of the stud. Note that they have a "bullet" end, so the usable length is around 75mm

I used blue locktite when installing the studs and have not had any issues with them loosening up and I change my wheels a lot. Yes some recommend using red, but I did want to be able to remove them without using a torch should I have to replace one. Some may also say they are cheap and will break and you need to get Tarett or Rennline ones at ~ $9.00 each.

[Nine8Six]

Originally Posted by 78F350

What should I have looked for as far as material, length, and other specs?

Material. if not 7075, and therefore 6k series, drop your torque a tad to account for this added solid plate's thermal expansion. That 6k series AL in those kind of thicknesses have displacements of as much as 0.2mm between 20deg and 60deg (e.g. track day). Zero.point.two sound little but translated into force it creates, the stress on the assembly can be kinda great. Threads are made of steel so obviously the wheel may potentially crack. (loll 986forum branded explosions, ppl dying, apocalypse)

If you don't use the spec'ed Porsche lug bolts (those w/ flex R14 ball), then loosen up the recommended torque by about 2~4ft. Therefore 92'ish. Well, if you plan on getting those wheels occasionally hotter than south summers mind you. All i can recommend you from this end.

Should be perfectly fine for street use. Adjust torque every seasons additionally.

Disclosure: I know nothing about cars, should all be fine as long as it looks good

[Burg Boxster]

Originally Posted by Nine8Six

Disclosure: I know nothing about cars, should all be fine as long as it looks good

LOL - That should be mandatory signature on every BMW board post until poster proves they know otherwise...