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4“ x 1/2“ (10 cm x Ø 1,27 cm) diameter true bar
4“ x 1/2“ (10 cm x Ø 1,27 cm) diameter bar ground to .0005 tolerance heat treated and black oxide treated. Place the true bar on the base in the tip, under the binding, and on the tail. Check for flatness by looking for light under the true bar in the middle or by the edges. On most skis you will notice that the base is slightly concave. Depending on how concave the base is will determine how difficult the ski or snowboard is to turn.
Concave Ski: The base is worn away more in the center of the base than at the edges. It is harder to initiate a turn on a concave ski, making it run or track as if it were on rails.
Convex Ski: Base material is higher in the center than at the edges. Skis will have a tendency to wander under foot and not want to go straight. It will also be harder to get on edge and hold that edge during turns.
Flat Ski: A ski that is perfectly flat from edge to edge. Flat skis are very unforgiving to even the most experienced skiers. Even the smallest movement will cause the ski to turn. Skis tuned on a stone grinder will have structure present in the edges and will ski as if they are concave.
Beveled Ski: Edges are slightly beveled (between 0.5° - 1.0°) in most cases. Bevel will make the ski/board more forgiving; the more bevel, the easier the ski will be to initiate turns and harder to catch an edge. The Flatness Tester determines if there is any bevel in the base edge, as well as whether the base is flat, concave, or convex. If the base is concave or convex, it will need to be stone ground by your qualified WINTERSTEIGER repair shop.
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