The comments on this forum so far is Wrong with the description of what "buff" means. It means the tire is buffed down to make the tire lighter, therefore if the tire is lighter it will turn quicker therefore produce more power to the rear wheels. If you're strictly a drag racer you'll want triple buff bead to bead, which is a tire that is literally buffed from bead to bead on the rim, and buffed down to less than an 1/8th inch thick. If you trail a little bit, you don't want triple buffs because due to being so thin, you'll pucture them on a stick, root, rock, whatever. A trail rider will probably just want regular buffed extreme or haulers. I hope this helps out on your decision and terminology on these descriptions.