IS300, the new wheels hit the calipers, we got spacers at 5/16th and now the log won't go on far enough so we are trying to mill down the spacer. Has anyone tried a spacer or went with a longer new stud?

 

As a general rule, the amount of thickness added by a spacer should also be added to the wheel stud.

So in your case, a 5/16" spacer should have a stud that is at least 5/16" longer.

I'd replace the studs rather than machine down the spacer.

BTW I'm planning on a spacer of similar thickness for my wheels not because of any rubbing, but because I want to increase the track of the car and get a wheel that is flush w/the body panel. Yeah, I'm going to get longer wheel studs.

 

Well it happens to be that I work for a fastener company. After some research I found out that you need to take the diameter of your stud which is usually 12mm and divide that by the pitch of the thread on the stud which is 1.5 so you need roughly 8 or more engaged threads on the nut or you risk the chance of the nut stripping right off the bolt and your wheel is flying off. So if you have a 12mm diameter stud, you need 12mm worth the thread, 12mm worth the thread divided by the pitch equals 8, well anyway you get the point. We could find the studs anywhere for the Lexus so we just grinded down the calipers .025-.050 and the wheels fit on fine!!