Gears and equipment racks make use of rotation to transmit torque, alter speeds, and modify directions. Gears come in many different forms. Spur gears are simple, straight-toothed gears that operate parallel to the axis of rotation. Helical gears possess angled teeth that steadily engage matching the teeth for smooth, quiet procedure. Bevel and miter gears are conical gears that operate at a right angle and transfer movement between perpendicular shafts. Modify gears maintain a particular input speed and enable different output speeds. Gears are often paired with gear racks, which are linear, toothed bars used in rack and pinion systems. The gear rotates to operate a vehicle the rack’s linear movement. Gear racks provide more feedback than additional steering mechanisms.