USUALLY when we get a new wheel set we have to go through a period of rationalization and question ourselves: Do we really need this? Will it really improve our ride? Will it make us faster? Will it motivate us to ride more? Do we get this, or purchase something nicer for our bike? The answer is “YES” !!!!!!!!!! With Mac Mahone OZONE carbon wheel set, all your questions will be vanished quickly; Besides with ranging from 10- to 42-teeth, the 11-speed X-DOME™ delivers an incredibly wide gear range while maintaining even, optimized steps. The single-unit cassette can be combined with Mac Mahone KING120 hub for a superior connection to the wheel. Contact Us Whether you are looking for information on any of our products and services, requesting wholesale pricing, or have any other questions, please feel free to contact us at info@macmahone.com . Our staff is always happy to answer your questions. Bing Su / International Sales