I already have a mountain bike, a 6"/6" suspension one. This Karate Monkey is going to romp the streets, hence the 50 tooth 1/8" chainring requirement.

I see that there are a few option in the 110 BCD for track chainrings, rarely 50 teeth, but it exists. Now, 130 BCD looks like a good compromise, and this would probably be the size that would feature the most outboard bearing BB's, right? Will I be able to find BB's that are long enough in this size?

What is the average chainline of 130 cranks?