Originally Posted by
YankeeGooner
So if I change my BB, the I can pretty much buy any crank/BB combination that will fit my 68mm English thread, keeping in mind that my current setup takes a 109.5-ish spindle?
If you're willing to swap out your bottom bracket, just select whichever BB is compatible with the crankset you choose. As mentioned above, you can find cranksets bundled with the appropriate bottom bracket.
As for spindle length, that's generally determined by the geometry of the crank arms. Your current cranks may require a 109.5 mm spindle, but it's quite possible that a different crankset would be designed for a different spindle length.