The base of the blade, hockey or figure, will have a slight curve to it. This curvature is known as the rocker, and if you continued the curve around to make a full circle, the diameter of the circle would be about 2m, or 7ft. The front part of the blade normally has a different rocker, which would form part of a tighter arc called the Spin Rocker. - http://www.everglides.co.uk/html/about_ice_skates.html
The rocker of your skate is the curvature or shape of the bottom of your blade from toe to heel. - http://www.thebladedoctor.com/skatefacts.html
What is the rocker? If you look at the blade from the side, you will see that it curves from front to back. This is the rocker. Blade companies generally specify the "rocker radius" for their different blades. If you draw a circle of this radius (typically 7 or 8 feet), approximately the back 2/3 of the blade will have a fairly circular contour that matches the arc of the circle with a 7 or 8-foot radius. The radius of curvature decreases toward the front (there is more curve), giving the blade a complex shape. - http://www.burlingtonskating.com/skates.htm#005
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