Tire - K780 Southwick II - Front - 80/100-21 - 51M Standard race compound allows for increased wear durability and also quick warm-up on cement start pads, Large radius support at knob base reduces knob roll in soft areas with hard base, Lightweight 4-ply rated casing structure with reinforced sidewalls, Wide space between rows self-cleans tread even at slow speed, Designed for sand and mud conditions