Mavic Cosmic Carbone 40 C Road Wheelset Mavic delivers the WTS (Wheel Tire System) to competitive cyclists 40mm Wind Tunnel optimized rim profile features 3K carbon fiber with an aluminum reinforced rim bed to enhance aerodynamics, resist impacts, deliver predictable braking and provide full clincher compatibility Maxtal aluminum alloy rims (core) offer a higher strength-to-weight ratio than conventional 6106 alloy TgMAX technology layers up several types of high technology resins and fixes them using a proprietary heat treatment process to achieve the highest possible resistance to braking heat