Helix Core e*spec Direct Mount Chainrings feature our narrow-wide tooth profile, for reliable chain retention and an extra long wear life. Designed with an adjustable 13.5-15.5mm offset via spacer, they provide adaptability to both 53 and 55mm chainlines for Bosch CX and SX motor systems. Helix Core e*spec rings are cold-formed from steel then heat treated to provide excellent durability and toughness, all at a price that’s easy on your wallet.

Chainline: 53/55mm
15.5mm / 13.5mm Offset
Colour: Black
Compatibility: Bosch SX / Gen4 CX Direct Mount
Material: 4040 Steel
Size: 34T, 36T
Weight: 189g