I run 22's in the front and 20's in the back..Seems to be a good combo atleast for me.I ride wooded trails, open fields and creek beds some...Also holeshots suck in muddy conditions..If you got mud like we do here in southern Ohio I'd get a set of MAXXIS Sur-Trak's or Vampires..I had Sur-Trak's that were 22x11x9 an they went well in the mud.