Compounded and designed for use on sport models for recreational and race use, Available in a tough 6-ply casing which maintains a profile that provides excellent traction for all 21" and 22" front sizes, Available in a flexible 4-ply casing for the MX sizes 20x6-10, Front Pactrax design and profile is also designed to offer excellent steering and cornering control, Compounded with a special natural racing rubber compound that delivers superb traction needed with extended tread life, Aggressive knobs provide excellent grip and traction in the most challenging and varying conditions