ans, as stated above, the BB and crankarms go together to create the chainline; thus, your bike frame was not "made" for any specific spindle length, but rather for a chainline. ISIS is pretty much obsolete now, so you won't see much choice in ISIS BBs. You'll have to decide whether to pay up and buy a new crankset that takes a more common BB, or pay up and buy an ISIS BB of the correct length for your crankset.