SRAM X-Sync EX1 Sprocket Chainring for Bosch Motors 16T Straight Steel ModelNumber=E4577 Less volume for slim feet

Less volume for slim feet or more space for growing feet

With the addition of the cold base to the lineup

supportive fit that won’t restrict movement

Incorporates Evo-Carcass U-Blocks and PaceStar Triple Compound

These rings are for use with 110 BCD 5 arm cranksets

SRAM X-Sync EX1 Sprocket Chainring for Bosch Motors 16T Straight Steel ModelNumber=E4577 Less volume for slim feetSRAM 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