e*thirteen Helix Core e*spec Chainring Variant:Bosch SX / Gen4 CX a chain tool is required

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

ODI has redefined grip performance again

increased power transfer

15 mm wide

Without the alarm function

e*thirteen Helix Core e*spec Chainring Variant:Bosch SX / Gen4 CX a chain tool is requiredHelix 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