FSA`s steel megatooth 4 bolt chainrings are perfect for MTB and E-MTB bikes with heavy-footed power ridersLong tooth profile enhances chain retentionThick Thin tooth design for maximum chain engagementCompatible with all 9, 10, and 11 speed chains as well as Sram 12s Eagle chains Not compatible with Shimano 12s or Sram 12s road chains104mm 4-bolt42TSteelBlackNarrow/WideUPC/EAN/GTIN: 840031065216