Designed in the USA, all Essor track wheels are made of carbon to offer optimal strength and stiffness. Essor wheels are a top choice for cycling enthusiasts as they are sustainable, reliable and scientifically designed for optimal performance. The hubs and spokes on Essor track wheels are built for maximum durability and weight consciousness to ensure they make your bike lighter, faster and more aerodynamic. Track wheels, built for single speed bicycles, are available in multiple sizes.