Race wheels are the best possible upgrade you can make to your current bike. High performance wheels can greatly improve how your bike handles, its aerodynamics and overall ride quality. While there are many different styles of race wheels for different types of racing, triathlon race wheels should be designed to provide an aerodynamic advantage
because wind drag creates the majority of the resistance faced by a cyclist in a non-drafting triathlon.
One hallmark of aerodynamic wheels is a deeper rim than found on standard wheels. Manufacturers use carbon fibre to build deep, aerodynamic rims because it is strong, stiff and light. Constructing an ultra-deep rim from aluminium is unfeasible because the rim would weigh a tonne. There are two types of carbon fibre rims: those entirely constructed of carbon fibre and those that use an aluminium rim bonded to a carbon fibre structure. Understanding some basic differences between aluminium and carbon fibre can help you determine which of these two types of wheels will best suit your needs.
Unlike aluminium, the carbon fibre used to build wheels is made of two different materials, carbon and resin, which is why it is called a composite. The long strings of carbon fibre resolutely resist bending and give the material its stiffness, and the resin acts as the glue that holds them together. Carbon fibre is different from metals in a few key ways.
*to read more please head onward to the following link - http://triathlete-europe.competitor.com/2010/09/30/carbon-wheels-faster/