Flat TrackDunlop’s DT4 tire is the Official Tire of American Flat Track. The DT3 has long been the benchmark for professional and amateur flat track racing alike ASPECT RATIO 80 Aspect Ratio 80 COMPOUND Hard CONSTRUCTION - (Bias) Compound Hard Construction - (Bias) FEATURES NHS (Not for Highway Service) Features NHS (Not for Highway Service) LOAD/SPEED INDEX - Load/Speed-Index - MARKET SEGMENT Off-Road Market Segment Offroad Mounting Position Rear POSITION Rear PRODUCT NAME Tire Position Rear Product Name Tire RIM DIAMETER 19 Rim Diameter 19 SECTION WIDTH 140 TIRE SIZE 140/80-19 TUBE TYPE Tube Type Tire Size 140/80-19 Tread Pattern/Model DT4 Tube Type Tube Type UNITS Each Units Each Vendor part number 637427 Width 140