I ordered a custom 5mm spacer for my IS350 to space out the rear wheels (advan rs). I plan on leaving the 5mm spacer on year round, and I need to know if the ARP extended studs will allow me to use the stock acorn lug nuts when i switch over to the stock wheels for the winter. If the ARP studs will not work can you leave a link to the specific extended studs I need.

Arp extended studs http://www.summitracing.com/parts/ARP-100-7715/

 

just get lugs with a sank on them.

 

Another option I have is the Ichiba extended studs. They come in 35mm, 45mm and 50mm. Anyone know exactly how wheel studs are measured? Is it from end to end or just the thread part of the stud? I believe the stock studs measure 36.5mm so i would think that the 45mm studs should work for what i want to do.

 

You are correct, from the first thread to the last thread is what is measured. And stock is 36.5mm.

I know this is an old thread but I am answering this for any future surfer that needs this info.

 

I have 45mm extended studs from Ichiba currently on my rears.....would 15mm spacers fit okay?