ALTER SC49B Chainring:49T. Teeth 7075/t6 BCD:144 Color:Black,Sliver Weight:135g #Steel_Construction #campagnolo #like4like #pista #trackn#bicycle#trackbike #fixie#njs #자전거 #픽시 #自転車 #ピスト#競輪 #fixedgear #Taiwan #場地車