SRAM X-Sync EX1 Sprocket Chainring for Bosch Motors 16T Straight Steel ModelNumber=E4577 With the addition of the

With the addition of the cold base to the lineup

supportive fit that won’t restrict movement

921g (with 30t and BB)

SIZES: 177

ShiftMount naming convention is [shifter type - brake type]

SRAM X-Sync EX1 Sprocket Chainring for Bosch Motors 16T Straight Steel ModelNumber=E4577 With the addition of theSRAM 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