SRAM EX1 E-Bike Groupset
The purpose-built e-MTB group. Just 8 big, burly gears designed to take full mid-drive torque and shift cleanly under power.
SRAM EX1 throws out the idea of cramming 11–12 thin gears onto an e-bike and instead uses 8 wide, heavily-built gears with big jumps. The result is a drivetrain that shifts crisply even under full motor load and resists the wear that destroys conventional cassettes on powerful e-MTBs.
It's a premium, specialized choice for high-torque off-road builds where durability and clean shifting under power matter more than tight gear spacing. For an aggressive Ultra or Bosch e-MTB, it's built exactly for the job.
Where to buy
Two paths — match your spend to the build. Quality picks last longer and come with real support; affordable picks get you rolling for less. Always confirm fitment, voltage, and connectors for your bike first.
Quality picks
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Pro tips from our test team
- The big gear jumps are a feature on an e-bike — the motor fills the gaps.
- Ideal for Ultra/Bosch e-MTBs that punish normal 11/12-speed groups.
- Pair with an e-bike-rated chain for maximum drivetrain life.