They are pretty much the same as the IRO's the difference though is in the bolt pattern 130 on the IRO and 144 on the alien... that is what is holding me up from buying one or the other, I cant make up my damn mind. I'm probably getting a jamie roy though so i'll probably just go with the IRO so i can have them just smacked on and shipped with my frame.

My only question is about the chainring that comes on the IRO, the one on the alien is a 1/8" but the IRO doesnt have it listed, has anyone gotten one from them? Anyone?