For street and offroad motorcycle applications Offers specific radial tubes for radial tires like supermotard or retro bikes with spoked wheels Straight 8mm diameter metal valve stem (Valve Stem Type TR-4) � Available in the following motorcycle tire tube sizes: 2.50-70/100-10, 80/100-12, 60/100-14, 90/100-14, 180/80-14, 140/90-15, 90/100-16, 130/90-16, 70/100-17, 110/90-17, 110/70-17, 120-130/80-17, 150-160/70-17, 100/100-18, 110/100-18, 120/90-18, 70/100-19, 100/90-19, 110/90-19, 2.75/3.50-21, 80/90-21 and 80/100-21