SRAM Eagle Powertrain

SRAM Eagle Powertrain is SRAM's full-power trail and enduro drive unit, a Brose Drive S Mag-derived system wrapped in SRAM's own firmware and AXS integration. The headline numbers are 90 Nm of torque, 680 W peak, 250 W rated, 36 V architecture and 2.98 kg at the cranks. Launched September 2023, it remains SRAM's only e-motor and is built around a deliberately stripped two-mode philosophy (Range and Rally) rather than the four- and five-mode ladders the German brands run. Community framing, fairly, is that this is a Brose with a SRAM brain.

The numbers. SRAM claims 90 Nm nominal and 680 W peak at 36 V, and independent dyno work has landed at the same 680 W ceiling rather than the inflated figures you sometimes see on competing units. There is no separate boost-torque figure: 90 Nm is the number, hold or release. The 250 W rated output is the EU homologation line, and OTA firmware via the AXS app has tweaked ramp curves and the auto-shift logic since launch rather than chasing peak watts upward. By 2026, rivals like the Bosch CX Gen 5 (100 Nm/750 W) and Avinox M2S (120 Nm/1000 W peak) sit above it on paper, so the Eagle Powertrain is best read as the lowest-output full-power motor in the current class, with the lightest weight (2.98 kg) of any 90 Nm unit.

Character and feel. The Brose lineage shows: smooth pickup, quiet belt drive, and a soft tail-off that flatters technical climbing rather than punishing it. Riders coming from Bosch describe the two-mode setup as either refreshingly simple or frustratingly coarse depending on temperament. Range mode gives a gentle, walking-pace assist; Rally hands you the full 90 Nm with a progressive ramp that rewards smooth pedalling rather than mashing. Noise is low under load, and freewheel drag is the standard Brose complaint, present but not severe.

Compatibility and ecosystem. The Eagle Powertrain runs a 720 Wh internal pack on most builds, with no factory range extender in the SRAM catalogue. Control is via the AXS Pod or the bar-mounted Eagle Powertrain controller, with a top-tube LED display and full setup through the AXS mobile app for firmware, mode tuning and diagnostics. The headline ecosystem trick is hardwired Auto Shift and Coast Shift with Eagle Transmission, which requires SRAM's specific AXS power cable (part 00.3018.418.001) to enable Smooth-Shift, and the 780 mm power cable for longer routing. Owners have also retrofitted the extension cord to replace the derailleur's own battery. Chainline is 55 mm Boost, UDH frames only for T-Type integration.

Reliability and known issues. No recalls to date. The most common owner gripes are software rather than hardware: occasional AXS pairing dropouts, a small number of reports of the unit refusing to wake until the bike is power-cycled, and the usual Brose-family belt whine on high-mileage units past 3000 km. The hardwired auto-shift protection logic, where the motor cuts power at the moment of shift, is broadly well-regarded and has reduced drivetrain wear complaints versus wireless-only setups. Error codes route through the AXS app rather than a dedicated display, which some testers find slower to diagnose trail-side.

Bikes you'll find it on. The Eagle Powertrain has a smaller OEM footprint than Bosch or Shimano but a loyal one. For enduro, the GasGas ECC Enduro 2025 (170/160 mm) and the long-travel Propain Ekano 2 2025 (180/170 mm) are the obvious picks. The Transition Repeater PT 2025 (170/170 mm) tunes Rally mode noticeably softer than GasGas does, favouring traction over punch. For shorter travel, the GasGas MXC Trail 2025 (160/140 mm) is the trail option, and the Nukeproof Megawatt 2024 remains a value benchmark on the used market.

Verdict. This motor suits riders who want quiet, smooth Brose-style delivery with the cleanest possible drivetrain integration via Eagle Transmission, and who accept 90 Nm when rivals offer 100 to 120. The honest trade-off is the two-mode interface: if you like granular Eco/Tour/eMTB/Turbo laddering, you will find Range and Rally too blunt within a week. Current SRAM flagship, launched September 2023, no announced replacement as of 2026.