Build your dream 12-speed mountain drivetrain around SRAM's lightest, stiffest carbon crank platform. This is the XX1 Eagle crank arm assembly on its own — carbon arms with an integrated DUB spindle and an 8-bolt direct-mount interface — so you choose the exact spider, chainring and bottom bracket to suit your build. This is the 165mm length in Lunar grey.

Highlights

• Carbon crank arms with integrated SRAM DUB spindle
• 8-bolt direct-mount spider interface for quick chainring and power-meter swaps
• 55mm chainline tuned for modern Boost mountain frames
• 174mm Q-factor
• 165mm crank length — the shortest option, popular for reduced pedal strike and a smoother spin
• Spider, chainrings and bottom bracket sold separately

Carbon arms, DUB spindle

The forged-and-bonded carbon arms keep weight low while resisting flex under hard pedalling, and the integrated DUB (Durable Unifying Bottom-bracket) spindle simplifies bottom-bracket fitment across frame standards. This assembly is the arms and spindle only — ideal if you already have, or want to specify, your own spider and rings.

8-bolt direct mount

The 8-bolt direct-mount interface lets you bolt on a SRAM 8-bolt direct-mount chainring or swap to a Quarq DZero XX1 Eagle power-meter spider without disturbing the rest of the drivetrain. Note this is the 8-bolt pattern, not SRAM's 3-bolt direct mount.

Compatibility & fit

Designed for 1x12 SRAM Eagle drivetrains with a 55mm chainline, suited to Boost 148mm rear spacing. Works with all SRAM MTB Wide DUB bottom brackets (BSA73, PF92, PF30, BB30 and more — bottom bracket purchased separately). Accepts standard 9/16" pedals. You will need an 8-bolt direct-mount spider/chainring or power meter to complete the crankset.