If I could resurrect an old thread here.......I run my cranks with the 110 mm eighthinch bottom bracket. The chain line looks straight to me but I haven't measured it if its actually 42mm. Even if I did measure it, no guarantees I could get it accurate enough to within a few mm. I like these cranks by the way. They are nice and thick and of course 144 bcd. It's ugly though. I tossed the stock chainring and picked up a 7075 47t and I'm good to go.