Bridgestone Spitfire S11R Sport/Touring Rear Motorcycle Tire 140/90-15 Spitfire S11, for touring oriented riders who also enjoy a sporty ride Bias-Ply general purpose Excellent tire for bikes of the 1970s and 1980s 4-ply casing, incorporating insert plies, and a refined belt technology that helps keep the tire round and cool even at top speeds.