The gs is everything you39d expect from a powertap hub with the added bonus of the dt swiss ratchet system technology from the press fit assembly with contact free seals to the dt swiss bearings to the exchangeable rotor body every dt swiss hub is designed to transform a rider39s energy into forward momentum combine powertap39s 15 accuracy with ideal strength to weight ratio and straight pull spoke technology you39ll get a stiffer more responsive and better riding whee