Bridgestone Spitfire S11 tires are a H-rated sport touring tire The Spitfire uses a 4-ply casing incorporating insert plies which is a refined belt technology that keeps the tires round and cool even at higher speeds Zig-zag and angled outer tread grooves provide wet weather performance by moving water to the sides, yet resist rain groove wander These are tubeless tires but tubes must be used when tires are used on tube-type rims