Girder Carbon Gen 2 Carbon Crank Arms

Praxis Girder Carbon Gen2 MTB Crankset – M30

The Gen2 Girder Carbon represents a new generation of high-performance mountain bike cranks. With updated carbon arm shapes, refined spacing, and a rigid M30 spindle, this crankset delivers exceptional stiffness, lightweight performance, and precise fitment for trail-focused riders. The updated 3-bolt direct mount ring interface ensures compatibility with modern MTB chainrings and optimal chainline.

Compatibility & Drivetrain

• Requires Praxis M30 Bottom Bracket (30mm drive bearing, 28mm non-drive bearing)

• Compatible with Praxis MTB rings and Shimano/SRAM 10- and 11-speed drivetrains

• Chainline options: 49mm or 52mm Boost

• Use only Praxis DM rings for correct chainline alignment

Specifications

• Sold as crank arms only – M30 BB and DM ring sold separately

• Carbon crank arms with improved clearance for a wide range of MTB frames

• Arm lengths: 165mm / 170mm / 175mm

• Q-Factor: 178mm

• 3-Bolt DM ring interface, compatible with any 3-bolt DM ring

• 8mm alloy main crank bolt for installation/self-extraction (50Nm torque)

• M30 spindle – requires Praxis M30 BB

• Reference weight: 488g ± (170mm set, no ring)

Important Notes

• Installation tools are not included and must be ordered separately

• Chainline is critical – do not use non-Praxis DM rings on Praxis cranks

The Girder Carbon Gen2 is a premium upgrade for riders seeking lightweight, rigid, and high-performance crank arms for serious trail riding.