ORIGINAL: Matt / PA
I have the XL belts on mine and they seem to accomodate a pretty big tree.........it "feels" like more than an extra 3" anyway.
Oh and you can make the XL belts (or the regular ones for that matter) go down to fit even the smallest diameter tree with a slight modification to the factory build.
GReg figured it out this season because he wanted to climb a tree in a fencerow about the diameter of a Lollipop stick and couldn't. LOL
He got to looking at what was keeping the platform belt from going all the way down and through like the climber section (hand climber) and figured out if you reversed the nut/bolt set up they use to clean up the lines of the stand it opens the channel to allow the belt to travel all the way through rather than stop when the ends hit the bolt.
I haven't gotten around to doing that to mine as I don't have much desire to climb teeny tiny trees, but Greg got a kick out of solving the problem and there isn't a small tree he can't climb now.........I know I'm gonna find him sideways bent over in a sapling one day.
I did that to my stand a couple months ago as well. I went to the hardware store and bought "pancake" head bolts to replace the ones that came on the stand.They are much flatter and allow the tractions belts to slide past them easier with out bumping into the head of the bolt and hanging up while you are feeding the belts thru the tube.