Benefits of Carbon Wheels

Bottom line - if you put carbon wheels on your bike you’ll be able to ride faster, for longer.
Whether you’re tired of lagging behind in group rides, or looking for competitive advantage when racing, if you want to do better in the saddle, you only have couple of options - training hard, or upgrading your bike. Upgrading your bike is certainly the easier of the two, and is usually undertaken first.

​When it comes to upgrades, the most effective change you can make is new wheels. When you’re talking about wheels, nothing performs better than carbon. There is no other upgrade possible on a bike that will have more impact on speed and endurance than carbon wheels.
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Carbon usually wheels are lighter and more aerodynamic than their metal counterparts. They’re also more rigid - the stiffer the wheel, the less it flexes under hard pedaling, the less energy you lose as a result. This means people using carbon wheels are able to do better with less effort. It’s easy to see their appeal. The advantage of deep aero rim is greater then the weight savings on a superlight alloy set.

True that super light alloy wheels,  will offer an advantage on long steep climbs, fast down hills and cross winds. But, if you don't have plans to go to the Alps any time soon, the deep carbon rim on rolling terrain will maintain speed with less drag, and that saves you energy for the final attack.
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Though they aren’t cheap, in terms of performance gain, carbon wheels have better value dollar-for dollar than any other component
Want to ride faster? Now you know how ;)