so i found a thread where dustinlikewhat was having a problem that's basically the same problem i'm having now...installed some cheapie bmx cranks (a little holdover till i get the profile ones i was talking about in another thread). from the center of the seattube to the center of the teeth on the chainring is 52mm, instead of 42. i'm not sure they're on all the way, so i'm going to try a 107mm bb and chainring spacers to bring them in closer...

now, from dustin's old thread, it seems i need to find a bb with an iso taper spindle to go with bmx cranks. but that they could also maybe be jis.

so i guess what i'm looking for here is a little input on whether it seems like i'm going about this right.

edit: also, i'm only really trying to get this within 5mm of chainline. perfect is, of course, ideal, but if it's 2 or 3mm off, meh, whatever.