Skate Blades 101 - Radius of Hollow

What is a hollow?

In skate sharpening, the term "hollow" refers to the concave groove that is cut into the bottom of the skate blade. This groove creates two edges on either side of the blade, and it is also known as the "radius of hollow" (ROH). The hollow is a critical aspect of skate sharpening, as it significantly influences a skater's performance on the ice.

The hollow is measured in inches or millimeters and represents the curvature of the groove. A smaller hollow, such as 3/8 inch or 9mm, means a deeper groove, while a larger hollow, like 1/2 inch or 13mm, indicates a shallower groove. The specific choice of hollow depends on various factors, including a skater's weight, skill level, playing style, and personal preferences.

Here's a general idea of how the hollow affects performance:

  • Deeper Hollow (Smaller ROH):

    • More blade makes contact with the ice.
    • Provides better bite and grip.
    • Improved maneuverability and agility.
    • Increased friction, which can slow down glide.

  • Shallower Hollow (Larger ROH):

    • Less blade contacts the ice.
    • Reduces friction, allowing for smoother and faster glides.
    • Decreased bite and grip.
    • Better for speed and straight-line stability.

Skaters often experiment with different hollows to find the one that suits their skating style and preferences. Ultimately, the choice of hollow is a personal preference, and players may adjust it based on their performance needs and the specific conditions of the ice they are playing on.