PBR developed an innovative line called RSS (Rubber Sprocket System) for 18NC front sprockets: a combination of very high robustness and fluidity and an exceptional noise absence thanks to the rubber injected in the holes created on the front sprocket.
Thanks to this solution the injected rubber lasts very long and avoid ungluing problems, keeping its reliability in intensive usage also after many kilometers. They are available for all sport street and big capacity offroad motorbikes