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Flexible Gear: The gears are flexible, the shifting is smooth,and the index is obvious Visible Gear Display: The visible gear display ensures a shift at a glance, convenient to use Brake Lever: The brake lever provides an ergonomic finger position and trigger handle Easy to Install: The installation is easy, the speed shifter work as soon as it is installed correctly EF500 is an upgraded version of ST-EF51, major difference is the shape of optical gear display EF51has a round shape of gear window, while EF500 gears displayed in one line, so you can see the gears much easier with EF500 Different shifter and derailleur have different ratio, it is suggested to use parts with the same model on bike This shifter is compatible with V brake system and Mechanical disc brake





