For the toughest jobs requiring ultimate traction and maneuverability in gritty environments, this rear backhoe tire is available in two R-4 tread patterns. The R-4 SL (pictured above, left) features a heavy-duty, flat tread surface for better traction and even wear. The more popular R-4 SLA (pictured above, right) provides a high-angled tread design delivering a smoother ride and on-road 
drivability.