SRAM Rocket Trigger Shifter - 3 Speed Left - 27 Speed CompatibleSRAM Rocket Trigger Shifter 3 Speed Left 27 Speed Compatible Designed to shift you past the toughest competition. SRAM compatible shifters are for riders who are as demanding on their shifters as they are on themselves. The SRAM Rocket is equipped with SRS technology for light indexing and a competition level gear indicator. Impulse Technology and 2: 1 Actuation Ratio for precise indexing and control Integrated indicator Alloy body with composite