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i think they now make titanium lug nuts... if that's what he's talkin about, they would in turn lighten the wheels in some way... like free up more unsprung weight
and tuner lugs are smaller lugs for smaller holes on "racing" rims and they come w/ a "key" since most of the rim's holes are too small for fit a socket in them
tread quarters, but watch them, i got mine from them and i put my wheels on and i dont know if the lug was stripped or if it was the way i put them on but one got stripped on the bolt, couldnt get it off, fell off 3 weeks later, $50 to press out and re-press a new knuckle