well if your talking about the g force it uses spacers where the hubs slides onto the axleon. one big spacer and one small on each side. so depending on which spacer you put on inside and outside, it will determine the with of the axle (4+ or 6+). if the big spacer is on the inside between the axle and the hub it will be 6+ and if the small spacer is in between the hub and the axle it will be 4+