Bike has huge four-inch wide tires that let this fun bike roll over all sorts of obstacles. Twist design shifters allow the rider to change gears quickly and easily through seven speeds assisted by a Shimano rear derailleur. The black/yellow boys' bike features disc brakes that can bring the massive tires to a stop quickly and effectively in most any riding conditions.The aluminum steel frame is both strong and durable and allows young boys to explore their surroundings on a true all-terrain bicycle. The bright yellow alloy rims are lightweight and will ensure that the bike and rider can be seen at all times. The Bike also features yellow handle grips.