Grooving
Straight grooves work best for forward bite. We recommend no wider than 3/16" wide of grooves. Wider than this may tend to cause the tread block to rip or peel back.


 
When using a very hard compound, you may want to 1/4 groove the tread blocks allowing for a greater degree of "cleaning" grooves and more edges for increased traction. Usually the tire is cut vertically and then horizontally or vice versa.



Grooves can also be cut at angles. Angled grooves will result in a combination of increased side bite as well as increased forward bite.

Unlike siping in which you should go no deeper than 1/2 the depth of the tread block, grooving can and generally is the full depth of the tread block. Also, the "hole" in the tread block(s) is called a "heat dispersion vent" which serves to reduce the chances of blistering.