Buy Online PanAme 21 Speed Fat Tire Adult Mountain Bike From Mountain Bikes. PanAme 21 Speed Fat Tire has Strong steel framed Mountain Bike and 4-inch supersized all-terrain knobby tires make the fat bike strong grip and anti-slip. PanAme 21 speed Fat Tire has strong, lightweight alloy rims to keep the weight down and make sure safety with front and rear disc brakes, The Price of PanAme is $320 with Usually ships within 2 to 3 days in USA.