System 3 Off-Road has continued tire development evolution and raised the bar for rock crawling and challenging terrains by delivering their most advanced tread to date.The RC500S, or "sticky compound" features a combination of proprietary soft tread compound and flexible 8-ply rated carcass which results in one of the best rock crawling tires on the market. The soft compound and carcass flotation set a new standard in slick surface traction.Super deep rim guard protects wheel lips and helps avoid pinch flats at lower psi.Deep .65" - 1.0" inter-locking tread blocks and optimal void excels on the trails while the wider spaced, staggered tread blocks grip in the loose terrain.