Lightweight kit consists of:
2 pulleys for shaft: diameter 59 to 20 teeth
2 pulleys adjustable diameter 59 to 20 teeth complete with hub lightweight made of Ergal with titanium screws and washers
Kit weight 0.44kg - you get a weight reduction of 0.54 Kg.
The pulleys and the hubs are made from Ergal 7075 T6 and have a hardoxidation of 50 microns.