Mountain Bikes has a great selection of PanAme Fat Tire 21 Speed Adult Mountain Bike that you can buy online. The PanAme Fat Tire 21 Speed is a sturdy steel-framed Mountain Bike with 4-inch-wide, all-terrain knobby tyres that provide excellent traction and prevent the bike from slipping. The PanAme Fat Tire 21 Speed Mountain Bike can be yours for $320 and typically delivers within 2–3 days in the USA. It includes powerful, lightweight alloy rims to keep the weight down and ensure safety with front and rear disc brakes.