e*thirteen Helix Core e*spec Chainring

Helix Core e*spec Direct Mount Chainring for Bosch CX/SX - 34T, Black

Helix Core e*spec Direct Mount Chainrings feature our M3 narrow-wide tooth profile, for reliable chain retention and 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 Gen4 and SX motor systems, or 55 and 57mm for Bosch CX Gen5. 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.

Long-lasting and economical steel chainring for Bosch CX Gen 4 motors

Narrow-Wide chain retention tooth profile

Adjustable chainline for 53 and 55mm on CX G4/SX bikes, or 55 and 57mm on CX G5 bikes