| http://www.w3.org/ns/prov#value | - m portion of the disc for providing traction between the shoe and the ground surface with nominal impact on the ground surface from gripping the ground surface with the nubs, the nubs having at least three different sizes, the sizes including large, medium and small, wherein the ratio of the length of the large size nubs to the length of the medium size nubs is approximately equal to the ratio of
|
