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The fork or slide: is the unifying element between the seat and the seatpost can be realized with different materials: steel, aluminum, titanium, manganese, carbon and various alloys. The difference between different materials for the construction of the slide is the cost of raw material, its weight and its mechanical properties. The slides are cheaper steel, the heaviest, but also with good ability to absorb vibrations. Excellent manganese, because light, absorbs vibrations well and did not cost too much. More expensive titanium, excellent characteristics, and the carbon that is characterized by low weight high capacity to absorb vibration, but also the high cost and a certain delicacy.

The choice of the slide: a good slide, must be made of a material that absorbs vibrations well, manganese is great, but also the various titanium alloys and magnesium are good. Steel is too heavy and good for a heavy economic and saddle. The advantage of a metal slide is its reliability, there is no danger that break. For the comfort and the best weight slide is carbon fiber, other than the cost is hight and its delicacy requires some attention in the assembly. A good slide should then have a scale that facilitates assembly, indicating the position of maximum advance and retreat, and positioning. The same slide, then, must be long enough to allow a good fit at any position (forward or backward), while taking into account that a saddle very advanced or very backward and often synonymous of a bike or misplacement of a frame the wrong size.