Shanks knew about the fruit from the "Devil fruit encyclopedia" (悪魔の実図鑑) If Kaku and Kalifa said they wouldn't know what their Devil Fruit. The Gum-Gum Fruit (ゴムゴム実, Gomu Gomu Mi) is a Paramythia-type body also allows the user to survive falls from heights that would kill a normal iphone-wallpapers.infog: bars. The Gomu Gomu no Mi is a Paramecia-type Devil Fruit that gives the user's body the to survive falls from heights and collisions that would kill a normal iphone-wallpapers.infog: bars.
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Has someone ate the gum-gum fruit before Luffy? By training his abilities, Luffy has found unexpected ways to increase his fighting ability, such as the ability to stretch his blood vessels wider to increase the speed of his blood flow in order to become faster and stronger, at a cost of depleting his body's energy at a faster rate. Though he had an idea of how they would work, Luffy had trouble with aiming and the timing of his attacks, and he was continuously sent spinning by the recoil.