SRAM X-Sync EX1 Sprocket Chainring for Bosch Motors 16T Straight Steel ModelNumber=E4577 921g (with 30t and BB)

921g (with 30t and BB)

Less volume for slim feet or more space for growing feet

}Kuat Hitch Lock for 1-1/4" Receiver Racks

ShiftMount naming convention is [shifter type - brake type]

SRAM X-Sync EX1 Sprocket Chainring for Bosch Motors 16T Straight Steel ModelNumber=E4577 921g (with 30t and BB)SRAM X Sync EX1 Sprocket Chainring for Bosch Motors 16T Straight Steel. The EX1 drive train was designed specifically for the demands of electric assist mountain bikes: a wide gear range with bigger jumps between gears and sturdy components to handle higher torque loads. Liberal use of features found on SRAMs high end MTB parts provide high value quiet operation and ease of service. X Sync (wide narrow) tooth profiles for great chain management