Hard to say. Chain length is a function of gearing, derailleur capacity, and chainstay length. If your derailleur can wrap the current length with a smaller inner ring, no worries (check on small-small combination). If it can't fully wrap the chain on small-small, take a link or two out, check small-small again for wrap, if good, check large-large to be sure that you're not running the chain too short. If it is too short on large-large after cutting a link, you'll need a rear derailleur with more wrap capacity.