Cane creek 40 series ec4940 bottom assemblythe 40 series sets the standard for performance durability and value drawing from the premium 110 series design the 40 series incorporates all the features necessary for a durable light weight long lasting headset to make it easier we developed consistent graphics interchangeable parts and over 40 configurations to meet almost every need sold in straight and tapered assemblies or tops bottoms cane creeks 40 series offers the largest fitmen