e*thirteen Helix Race 8-Bolt Chainring - 32t 11/12-Speed 3mm Offset 8-Bolt Direct Mount BLK MFPN=4B-SN3180020-102-0009-AM Built in tunable progression or

Built in tunable progression or “bottom out resistance” with a secondary air chamber and valve

Class-leading low wear on chain components

The same self-lubricating compound as on SKF’s motorcycle fork seals

160mm Q-Factor

High Load DU bush system

e*thirteen Helix Race 8-Bolt Chainring - 32t 11/12-Speed 3mm Offset 8-Bolt Direct Mount BLK MFPN=4B-SN3180020-102-0009-AM Built in tunable progression ore*thirteen Helix Race 8 Bolt Chainring 32t 11 12 Speed 3mm Offset 8 Bolt Direct Mount Black. Helix Race 8 Bolt Chainrings are an update to any 8 bolt drivetrain. Exquisitely machined from 7075 AL theyre stiff and durable and provide a significant weight reduction over competitors. A unique four bolt locking interface reduces assembly weight while improving longevity and ease of assembly and maintenance. Featuring e*thirteens M4 narrow wide tooth