PROVEN CROSS-COMPATIBILITY APPLIED TO AN ULTRA-LIGHTWEIGHT, DURABLE AL-7075-T6 CHAINRING. HIGHLY CNC'D TECHNICAL FINISH. AVAILABLE TO MATCH HELIX CASSETTE COLORS. SRAM(TM) COMPATIBLE 3-BOLT DESIGN. A technology first. Combine with the chain, derailleur/shifter of choice without a change in chain retention quality. Build a dream rig with more freedom and spec creatively. Available in bold colors to match the popular e*thirteen Helix R Cassettes, Plus 35 Stems, and Quick Fill Plasma Valves.