This tire is optimal as a rear tire on a 250 & 450 Off Road bikes in Supercross and Motocross. The new C100 Construction offers more performance and longevity over the previous version. This construction now complements the 07113 MX25S and MX30S to help balance the stiffer construction on the front end. The IMX20 compound is great for indoor groomed tracks or soft track conditions. The IMX25 compound offers a tremendous amount of performance and is the most popular compound choice. This compound is a great intermediate all around compound used mainly in Supercross and Motocross. The IMX30 compound is great for hard packed conditions or for the rider that needs a tire with a longer lifespan but still the performance needed to win. Optimal air pressure range is 12-15 psi.