SRAM Dual Drive 8 Speed Rear Shifter With Gear Cable - SilverSRAM Dual Drive 8 Speed Rear Shifter With Gear Cable Silver The 8 speed rear trigger shifter from SRAM features Impulse technology with intuitive multi release actuation a gear indicator, a strong alloy body with a composite lower cover and stainless steel hardware. The rear trigger shifter is compatible with SRAM DualDrive hubs and 1: 1 rear derailleur. SRAM Dual Drive 8 Speed Trigger Shifter Rear Impulse Technology: Intuitive multi release actuation