130 is the standard shimano bcd, probably the crankset u have already is JIS so "maybe" u dont need to change the BB. What brand is the actual set of cranksets? secondly what bike are we talking about? Some bikes have bended chainstays and 180 mms is a pretty long set of cranks...that i have seen in some cheapo bikes to be a problem.

ALways u can keep the 170 and put a 53 or a 50 shimano road chainring. This will give you more inches per pedaling if that is what are u looking for.