I've always ran exclusively 20" .325 on my 50 cc saws....they pull em just fine.... I would probably never run anything shorter on a 50cc saw.I'd like to take my 550XP up to 20". Where's the sweet spot in bar and chain? Most of my cutting is soft west coast wood and I love the current balance, handling and power of this saw but would like a little more reach. If I go with a Oregon Speed Cut lightweight bar and narrow kerf chain would that compensate for the tradeoff in power, weight and balance of moving to 20"? Any other suggestions?