Direct mount steel chainrings for use with Bosch Gen4 equipped E-BikesFSA megatooth profile teeth for positive chain retention and performanceFor use with boost 148 spacingCompatible with all 9, 10, and 11 speed chains as well as Sram 12s Eagle chains Not compatible with Shimano 12s chains or Sram 12s Road chainsDirect Mount34TSteelBosch Gen4BlackNarrow/WideUPC/EAN/GTIN: 840031064158