The importance of base structure

The first installment in the series on tuning tips involves the importance of base structure.

Base structure is a pattern that is ground into the base of the ski, generally to repel water and break up suction in wet snow as well as provide improved gliding capabilities in cold and very dry conditions. Base structure is also important because it aids in the turning ability of the ski. There are many variable structure patterns to choose from but most fall in the basic category of either linear or cross structures. The depth of the structure is also extremely important and is warranted by varying snow conditions and temperatures. In cold, dry weather a fine structure with a linear pattern is best because the cold, crystalline snow calls for a smoother structure pattern to minimize friction caused by the drier air (low humidity) and on new or fine-grained old snow. A structure of medium depth works well in temperatures right around the freezing point (32 degrees), while a coarse structure provides optimal performance in wet snow and with
temperatures well above the freezing point because the deeper channels repel water and break up the suction created between the ski and snow. But beware of one caveat: a coarse structure does not work as well in colder, drier conditions as the deeper cut structure pattern acutally
increases static friction under these conditions. While a fine, linear structure can be applied by hand using a stiff, steel bristle brush it is best to have a structure pattern applied using a stone grinding machine at your local ski shop. Discuss which pattern would be best for your skis with the technician as he or she will be able to assist you in choosing the one that is best suited for the climate you race in as well as the brand of ski. A fine, broken structure may produce a fast race base on an Atomic GS ski where as a medium depth, cross or broken structure pattern may be best suited on Volkl RaceTigers. Check with the tuning tech for options. And remember this: once the skis have been stone ground it will take numerous cycles of hot waxing, scraping and brushing before the skis will be 'race ready' and able to perform at their optimal level. This process will be discussed later in the series on tuning tips.

Check in again next week for Part II in the series on tuning tips when we will review the importance of the proper base and edge angle on your race skis.

Until next week...

Joe Pinto, Jr.