e*thirteen Helix Core e*spec Chainring Variant:Bosch SX / Gen4 CX 80mm lengths to suit your

80mm lengths to suit your rim profile

and most other components with a hex fitting

Stiffer and stronger than most 300+ grams handlebars

Without the alarm function

a chain tool is required along with a master link and Power Lever X

e*thirteen Helix Core e*spec Chainring Variant:Bosch SX / Gen4 CX 80mm lengths to suit yourHelix Core e*spec Direct Mount Chainrings feature our narrow wide tooth profile, for reliable chain retention and an extra long wear life. Helix Core e*spec rings are cold formed from steel and then heat treated to provide excellent durability and toughness, all at a price that's easy on your wallet. Features Long lasting and economical steel construction. M4 narrow wide tooth profile for excellent chain retention and Shimano SRAM drivetrain