SHIMANO 110BCD R9200 R8100 Completely closed Narrow Wide Chainring

Model  42T or  44T or 46T or 48T or 50T or 52T or 54T or 56T or 58T or 60T Colour Black Made from 7075-T651 Aluminum Alloy Surface coating Anodizing Made with CNC milling Chainring shape Round Compatible cranksets Shimano FC-R8100 - ULTEGRShimano FC-R9200 - Dura-Ace Weight, grams  99 (42T), 109 (44T),111 (46T), 132 (48T), 133 (50T), 159 (52T), 176 (54T), 196 (56T), 217 (58T), 234 (60T), Chain compatibility Standard 9/10/11/12 speed  Support paying an extra $10 to customize the same silver color  Bicycle shop or dealer contact customer service              PASS QUEST NARROW WIDE CHAINRING The Fully enclosed transmission Chainrings ismilled from a whole aluminum plate by CNc, which ismilled thin and chamfered to ensure strength whilereducing the weight of the gearbox. The gearboxsolves the problem of chain drop and chain noisefrom the root by optimizing the internal structureand transmission system. (BCD:THE CENTER HO