e*thirteen Chainring Direct Mount 34T Helix Race

e*thirteen Helix Race Chainring Direct Mount 34T 52/55mm Flip Flop Shimano/SRAM 11/12 speed Chain Compatible Grey Chain retention Updated M4 narrow-wide tooth profile improved retention, reduced chain noise, and decreased system wear. Chainline Flip-Flop - 52mm (Boost) and 56mm (Super Boost) Color Gray Compatibility Helix R Direct Mount, Helix, TRS, LG1 and XCX Direct Mount cranks (spacers required for some applications)