The SRAM EX1 is an 8-speed rear derailleur designed specifically for eBikes — engineered to handle the higher chain loads and torque outputs that motor-assisted riding generates. X-HORIZON geometry keeps chain tension consistent through varied motor output and terrain, and the derailleur is compatible with SRAM's EX1 drivetrain ecosystem designed for Class 1 and Class 2 eBikes.

Highlights

• 8-speed eBike-specific rear derailleur for SRAM EX1 drivetrains
• Engineered for motor-assist torque — reinforced construction
• X-HORIZON geometry for consistent chain tension
• Compatible with EX1 eBike shifters and cassettes
• Designed for mid-drive motor eBike applications

eBike-specific design

Standard MTB derailleurs aren't built for the sustained high-torque loads a mid-drive motor applies through the drivetrain. The EX1 addresses this with heavier-gauge materials and a clutch mechanism that handles motor output without premature wear or inconsistent shifting — it's purpose-built for the eBike environment rather than adapted from a standard MTB part.

Fit and compatibility

8-speed eBike rear derailleur. Compatible with SRAM EX1 8-speed drivetrains and EX1 shifters. Designed for mid-drive motor eBike applications. Confirm frame compatibility and motor system before ordering.