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ha it was annoying as hell cause at first my aftermarket wheels wouldnt fit and i was like damn.. :\ but then i put it together and figured or if it has threads it probably comes off. but its pretty pointless... :\
I believe it is there to keep from swapping the front wheels with the rear wheels. That is what I have been told. Could be true?...
Correct. The "6th lug" is there so that the rear wheels cannot be mounted on the front. Has to do with the fact that the sizes are offset, and the rear wheels are wider than the front.
It can, however, be removed if you want to install aftermarket wheels.