Are you looking for a revolutionary rear derailleur that will lift your bicycle gear to unimaginable heights Shimano Ultegra RD-R8150 - a shifter that redefines the limits of speed and precision. This is Shimano's fastest rear derailleur ever - we're talking an astonishing 58% faster than their RD-R9150 model! The rear derailleur has undergone a comprehensive redesign and now you can enjoy the benefits of its compact design that integrates a wireless unit, charger and switch with sliding simplicity. It has a built-in LED status indicator that notifies you of battery level, pairing and adjustment status - all to ensure you have a hassle-free and streamlined cycling experience. It is specifically designed to be compatible with 28-34T, thanks to its unique cage length - this makes it more versatile and adaptable than ever before.Specification List:Compatibility: 12-speedDirect mounting58% faster than RD-R9150Compact design with integrated wireless…