A lightweight and affordable e-bike spider compatible 104BCD chainring, with excellent chain retention and wear-life. The Helix e*spec 104BCD chainring features a lightweight, stiff, and durable 7075-AL construction and e*thirteen's latest M4 narrow-wide tooth profile for excellent chain retention and wear life. Helix performance and an affordable price make this the perfect match for any 104BCD spider or the e*thirteen Turbocharger spider-bashguard. - M4 narrow-wide profile delivers enhanced chain retention and cross-compatibility with Shimano, Sram, and TRP 11/12s drivetrains, including T-Type - Forged-CNC 7075 AL for ultralight weight, with high strength, stiffness, and wear-life - 32/34T sizes complement e*thirteen wide range cassettes - Compatible with 104BCD spider-based e-bike chainrings and e*thirteen Turbocharger Spider-Bashguard assemblies