it's a DURO HF302B rear 4.0-18"... I bought 2 of them because they are only 56 bucks a piece. little flat on top :roll:, i hope they handle corners. bike bandit had a sale for (2), got them for 125 bucks. we'll find out...Kenny Roberts did say the easiest way to learn how to slide was on cheap tires, but that was NOT my original intention! Any reviews on these tires?