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Shimano Di2 (ел. превключване на скорости)
Di2 For EveryoneProfessional riders have trusted SHIMANO DURA ACE Di2 technology for years in big races and tours, and they have not been disappointed. They have crossed the highest mountains, experienced really bad weather conditions and even worse road conditions. Even cyclocross riders use this group set. Now the time has come to make this technology more affordable: Shimano has adopted the Di2 technology to the way less expensive ULTEGRA Di2. Anyone opting for Shimano Ultegra Di2 doesn't have to worry about the technology. You'll be able to exert your fullest effort in even the most extreme of conditions. Ultegra Di2 has been built upon the experience of countless professional cyclists. If it works for them, then it will work for you.
Levers have been ergonomically designed for maximum control and total comfort. Derailleurs shift as quickly as you fingers can move. One click and the right gear is engaged instantaneously. Di2 is faster than regular shifting systems. In a sprint, a fraction of a second's difference in shifting speed can be the difference between winning and losing.