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Old 08-28-2015, 11:48 AM   #1
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How important is it to run these? I have 9" 6ULs and RS3 tires with 949 aluminum wheel nuts. Do I need to run the longer studs or not?
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Old 08-28-2015, 12:08 PM   #2
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A general rule for aluminum, you want 1.5-2 times the diameter of the shank worth of engagement. So an M12 stud wants 18-24 mm engagement, which for a 1.5 thread pitch means you need 12-16 full turns of the lug nut.

If they were steel, 1 times the diameter, so you would only need 8 full turns.
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Old 08-28-2015, 02:19 PM   #3
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So either go back to steel lug nuts or put on the longer studs is the answer?
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Old 08-28-2015, 02:33 PM   #4
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That would be my suggestion. Granted, 1.5 - 2 times the diameter is necessary for maximum grip strength, and less than that may be okay for this load case. But, when I witnessed my friend put on 949 lugs on 6UL's, I didn't like the amount of thread engagement. Maybe someone else has actual track experience to comment.
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Old 08-28-2015, 03:18 PM   #5
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Thousands of track cars are running 949 aluminum lug nuts with 949 6UL wheels on stock studs. ARP studs with more thread engagement would be even more secure, but I would consider the above combo adequate based on the success rate.

-Ryan
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Old 08-29-2015, 12:21 AM   #6
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The general rule for holding any thread is 1.5 times the diameter of the rod, and mil-spec likes if you have two threads poking out of the end of whatever you're fastening.

Pretty sure the 949's wheel studs have more than 1.5 times the threads. And I think that's a good & smart thing.
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Old 09-14-2015, 02:28 PM   #7
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Anyone use Applied Racing Technologies studs?

http://www.appliedracingtechnology.com/products.php
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