SRAM EX1 Trigger 8 Speed Rear Trigger Shifter with Discrete Clamp, BlackThe 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. Dual position clamp attachment gives riders fitting options Cable pull ratio matches the EX1 cassette and derailleur Product Specifics