Fsa sl k sbs sb20 seatpostthe sl k sbs sb20 seatpost is lighter and stiffer than ever just 222 grams for the 272 x 350mm length using a ud carbon shaft with a bonded alloy head and a sophisticated mtc clamp design we can achieve what we believe is the finest seatpost yet features material ud carbon shaft with bonded alloy head forged alloy sbs 2 bolt head cr mo steel hardware finish ud carbon setback 20mm 0mm weight 221 grams 272 x 350mm not di2 compatiblebuyfsa componentsf