The Superstand Extreme is manufactured to the same standards as the normal SUPERSTAND, welded base with removable top hoop, but suits wider tires up to 3.25` The Superstand Extreme is manufactured to the same standards as the normal SUPERSTAND, welded base with removable top hoop, but suits wider tires up to 3.25` Suits downhill, mountain bikes and the newer 27.5` PLUS and 29` PLUS wider tires & wheels