Does anyone know if the 120/80 slick is front and rear use or just rear use? Anyone use the 120/80 on the front with the 130/75 on the rear?

Additionally, does anyone have a list of the actual tire diameters? Maybe we could use a sticky in here with the real tire spec info (120 or 130 doesn't always actually mean 120 or 130mm - could be 122mm and 128mm wide).