Well I only live a mile from a custom bar maker that's very popular nationwide and he has made up to a 102" bar for a guy with a huge oak. In reality that 090 will pull a 60" bar with a ton of authority but that 84" really taxed it. I wouldn't want to try more bar without it having a double headed bar setup. It is kinda funny that the 880 with the big 36" bar is only the pilot saw for the really big 84" one.