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