Durable Wide Single Designed for On & Off-Road Service. The GI-378 provides an exceptional balance of on-road stability and off-road traction. On the road, the specially designed tread pattern provides optimal traction and handling while the wide outer ribs provide stability even under heavy loads. Off the road, the stone drilling prevention features keep debris from penetrating the casing. Up to 20-ply rated for extra load carrying capacity, the GI-378 is cost-effective solution for on and off-road service.