e*thirteen Helix Alloy GR Cranks & GR Direct Mount Chainrings 

Specs:

Chainline: 

• 83mm spindle cranks: Helix GR Chainrings for 56.5mm chainline
• 73mm spindle cranks: Helix Chainrings for 55mm chainline

Chainring: 

• 83mm spindle cranks – Helix GR Chainring
• 73mm spindle cranks – Helix Race, Helix Plus, or Helix Steel DM Chainrings 

*Not compatible with SL or UL Chainrings 

Ring Color: Black, Sterling Silver

Features:

• Exceeds ASTM 5 standards for gravity use 
• Forged and CNC Machined for optimized strength-to-weight ratio and classic styling 
• Molded crank boots 
• Adaptive Preload System (APS) 
• Proven P3 Connect polygon spindle interface

Length: 160mm, 165mm

Material: Forged, CNC Machined AL 6066-T6 arms, 30mm AL 7075-T73 spindle

Spindle: 

• Width: 73mm or 83mm
• Diameter: 30mm
• Interface: P3 Connect

Weight:  

• 83mm x 160mm: 590g / 664g w 34t Ring
• 83mm x 165mm: 607g / 681g w 34T ring
• 73mm x 160mm: 584g / 638g w 34T Helix Race Chainring
• 73mm x 165mm: 599g / 653g w 34T Helix Race Chainring

Helix Racr GR Direct Mount

Chain Retention: Updated M4 narrow-wide tooth profile improved retention, reduced chain noise, and decreased system wear

Chainline: 56.5mm with Helix Race GR 83mm spindle cranks

Color: Black, Sterling Silver

Compatibility: Helix Race GR 83mm Spindle cranks (73mm Cranks use Helix Race Chainrings) 

Material: AL 7075-T6

Size: 34T / 36T options

Weight: 34T: 74g / 36T: 79g