Generally, the grooving blade is reversed to result in two independent cutting blades. The depth should be set no deeper than 1/2 the depth of the tread blocks. Deeper than 1/2 the depth may cause individual tread blocks to rip or chunk out. When setting the depth of the blades for siping, place the siping head on the tread block and visually adjust the depth to 1/2 the thickness of the block.
Proper siping of this tire has resulted in a very nice texture or grain to the tread surface. The siping allowed the tire to "fire" quickly on starts or re-starts and as the race went on, the sipes allowed heat to be expelled which resulted in less chance of blistering.
