Originally Posted by
Andrew R Stewart
Well, the rightest thing to do is to make your best judgment then install said BB. Now you can check the actual chainline and other dimensions (like crank arm or ring clearance with frame or "Q" factor) and if needed remove the tester BB and install the now "corrected" size. Anything else is just assuming. Andy.
Thanks Andy. I'm finding this problem is a bit of a puzzle. Almost like building a computer, all of the parts have to fit together correctly.
I KNOW I want the nexus 8 which has a chainline of 42mm. That means I'd like to find a crankset that can also provide a chainline of 42mm. That's proving... difficult. I saw one that said it had a 45mm chainline with a 103mm BB! I didn't know they MADE 103mm BBs. And I'd have to go even smaller if I wanted a 42mm chainline. If the chainring mounts to the inside of the crank, I can use spacers, but I'd prefer not to as they just provide complication (and more of an opportunity to creak.) Puzzle indeed.