SRAM

 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 6mm ...

 Sram X-Sync direct mount steel chainrings for 11s Narrow/Wide tooth profile design increases chain retention, wear life, and reduces friction and noise 3mm offset for use with Boost GXP or BB30 Direct Mount 28T Steel Black 11sp Narrow/Wide 3mm