Open or closed lugs?

[87-WE2]

Sorry if this has been asked a million times, but I searched and there were a mountain of results.

I know the difference between open & closed lugs, but what are the advantages / disadvantages of each? I'm about ready to order yet another set of wheels and have a choice in lugs. Street car that goes to the track a few times a year.

 

[augie1010]

NHRA and IHRA require open lugs if you are going to race with slicks. They want to see how much stud is in the lug.
David
,87 GN

 

[87-WE2]

So if I'm on drag radials closed are ok? I think I've found some info by searching "prostar" as those are what I'm considering.


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[Boost231]

Depends on the track. I've been asked to pull a lug so they can see how many threads are sticking out with drag radials

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[bison]

So if I'm on drag radials closed are ok? I think I've found some info by searching "prostar" as those are what I'm considering.


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If you are on stock lugs you are not even close to ok with pro stars. The front wheels need to be in compliance also. Not just the rear.


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[87-WE2]

Yeah, stock lugs won't work with pro stars anyway as stocks are acorn-style and pro stars take a mag-style with washer. The stock studs might not even work - looks like they might need to be longer.

Thanks - I've found the information I need in order to comply. For future reference, here's the wording from Section 20 of the General Regulations of the NHRA :
"The thread engagement on all wheel studs to the lug nut, or lug bolts to wheel hubs, must be equivalent to or greater than the diameter of the stud/bolt. Length of the stud/bolt does not determine permissibility. (Example: A 7/16-inch stud must be thoroughly engaged through the threads in the hex portion of the lug a minimum of 7/16-inch.)"

It looks like it may not be possible to run stock rims and ProStars on the same studs.