SRAM Dual Drive 8 x 3 Speed Shifter Set With Gear Cables - SilverSRAM Dual Drive 8 x 3 Speed Shifter Set With Gear Cables Silver The 8 x 3 speed dual drive trigger shifter set 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 trigger shifters Impulse Technology: Intuitive multi release