Shimano FC-4403 is a chainwheel set designed for use with 9-speed chains. It features three chainrings with 52, 42, and 30 teeth, providing a wide range of gears for different riding conditions. The chainwheel set is made from durable materials and is designed to withstand the rigors of everyday riding. It is compatible with bottom brackets with a 68mm shell width and a spindle length of 113mm. The FC-4403 is a versatile chainwheel set that is suitable for a variety of riding styles, from casual cruising to serious racing.