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You’ll likely need to tune your skis once in awhile to ensure that you’re skiing on flat skis. If you hold a true bar across your skis, you can see that they do bend over time. It is ideal to have flat skis in order to ensure best results. Racers who ski for competition can tell you that a fraction of a second counts. And the flatter your skis, the faster you’re going to move.

· The first thing you should do is use a true bar (a bar that is generally made out of steal and is perfectly flat) to see how flat your skis are. You’ll want to measure your skis in several places in order to make these determinants. You may also be able to tell simply by looking at your skis just how flat they are. You can more or less tell if your skis are curved at all by placing the true bar on one end of the upside down ski and looking forward carefully at the true bar. If you see light over the true bar rather than ski, your ski curves downward; if you see more ski than light, it curves upward.
· If you see light in the center of your ski, it’s more concave than it should be. You need to clamp your ski in a vise to hold it still. Use a 10-inch file to make strokes from the curve of the toe all the way to the tail. Do this repeatedly over the same area until the edges and base are even. While you’re tuning your skis, you’ll want to check them regularly to make sure you’re tuning them correctly. Do this by using the true bar repeatedly and judging your progress.
· If you see light on the edges of your ski, it’s more convex than it should be. You should again clamp your ski in a vise and hold it still and use a metal scraper to even your skis. You should hold the scraper at a 30-degree angle and push it along the base of your ski until it’s even. Again, you’ll want to check your progress regularly to make sure you’re tuning them correctly and can do this by using the true bar.