Replace a damaged arm or fine-tune your fit with a genuine SRAM XX Eagle E-MTB crank arm assembly in a 175mm length. This is the carbon, foam-core arm engineered for the high-torque world of pedal-assist mountain bikes, ready to pair with SRAM's T-Type Eagle Transmission direct-mount chainring.

Highlights

  • 175mm crank arm length, offering maximum pedalling leverage for taller riders
  • Carbon arm with a foam core for low weight, high stiffness and strength under e-bike torque
  • ISIS spindle interface with a self-extracting bolt for tool-light installation and removal
  • Built for the XX Eagle Transmission (T-Type) direct-mount chainring
  • Black finish, ready for the optional Gap Cap cover for a clean motor integration

Made for e-MTB power

The XX arm uses a carbon shell over a foam core so it stays light without flexing when a mid-drive motor adds its torque to your own. The ISIS (International Splined Interface Standard) connection keys the arm to the motor spindle, and the integrated self-extracting bolt means the arm threads on and pulls off cleanly during service.

Part of the Eagle Transmission system

This is a crank arm assembly only. It is designed around SRAM's XX Eagle Transmission (T-Type) direct-mount chainring, which bolts straight to the spindle for a precise, hanger-free 12-speed drivetrain.

Compatibility & fit

Fits ISIS-spindle e-bike drive units including Bosch (BDU31/SX, BDU37/CX Gen4, BDU38/CX Gen5) and DJI Avinox (M1, M2S). The crank cap, chainring and bottom bracket are not included. If you are unsure whether this arm suits your motor, contact us before ordering.

SRAM warrants this component to be free from defects in materials or workmanship for two years from the date of original purchase. The warranty applies to the original owner and is not transferable. It does not cover damage from crashes, misuse, improper installation, or normal wear.

For any warranty support, please return the item to Tune Cycles with your proof of purchase and we will manage the claim on your behalf.

  • Genuine SRAM XX Eagle E-MTB crank arm assembly (FC-XX-PA-D1)
  • 175mm crank arm length
  • Carbon arm with foam core construction
  • ISIS spindle interface
  • Self-extracting crank bolt
  • Designed for XX Eagle Transmission (T-Type) direct-mount chainring
  • Compatible with optional Gap Cap cover
  • Black finish
  • Crank cap, chainring and bottom bracket not included
BrandSRAM
ModelXX Eagle E-MTB / Transmission
Part numberFC-XX-PA-D1
Crank arm length175mm
Arm materialCarbon with foam core
Spindle interfaceISIS
Crank boltSelf-extracting
ApplicationPedal-assist (e-MTB)
Chainring mountXX Eagle Transmission (T-Type) direct mount
DrivetrainEagle Transmission 12-speed
Drive unit compatibilityBosch (BDU31/SX, BDU37/CX Gen4, BDU38/CX Gen5), DJI Avinox (M1, M2S)
Crankset offset39mm
FinishBlack
IncludedCrank arm assembly only (crank cap, chainring and bottom bracket not included)
SKU PSI-SR006118663005
Model # 006.118.663.005
Barcode # 710845887079
Brand SRAM

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