conical taper, but im not positive on the degree, but i think it might be 60 but thats just guessing based on eyeballing it.
i got konig heliums, if that helps. 10.2 lbs a piece, thats over 4lbs lighter than a vw aluminum 13 inch wheel, and over 6lbs lighter than a vw teardrop 14!
what sucks about them is that they dont mention anything about the lugnut taper. it just says to check with youre installer for these details. well i dont have an installer. i mount and dismount my own wheels and tyres. i bought a tyre mounting machine for this purpose. my uncle has a digital tyre balancer, so i can do everything in house without going to an installtion shop.