Okay, here's what I hope is a simple question:

My rear wheel chainline is 42mm. My BB has a 68mm shell. I need to know of some BB/crankset combinations that will produce a close-to-perfect chainline from front-to back.

I have a Redline Monocog crankset that I'd love to make work, but I don't want to buy several BBs to figure out which one has the right spindle length. I'm willing to get a whole new crank/BB if I can get one that I know will work.

Thanks in advance for any advice/suggestions/formulas/clarifications you're willing to share with me.