Compatible with: X1 (with removable spider only), X9, X0, XX, X01, XX1 Saves 25-50g compared to standard spider and chainring design Tall square teeth edges engage the chain earlier than traditional triangle shaped teeth Designed with mud-clearing recesses for the inner chain links and rollers Fully CNC AL chainrings GXP uses 6mm offset BB30 uses 0mm offset Direct Mount 28T GXP Black 11sp Narrow/Wide 6mmUPC/EAN/GTIN: 710845765759