-3mm Offset, 3-Bolt Direct Mount design for compatible with SRAM 3-bolt direct mount compatible cranks Cut from billet AL-7075-T6 for the highest strength and wear resistance SRAM and Shimano 11 and 12 Speed Chain compatible "Boost Spacing Only" Extensive CNC machining for ultra-light weight (32t=51g) and looks that kill Available in bold colors to match the popular e*thirteen HELIX R Cassettes, Plus 35 Stems, and Quick Fill Plasma Valves! The Helix R 3-Bolt Direct Mount Chainrings, engineered for SRAM 3-Bolt crank systems, merge aesthetics with robust durability. e*thirteen's narrow-wide tooth profile ensures compatibility with Shimano and SRAM 11 and 12-speed drivetrains. Manufactured from AL-7075-T6 aerospace-grade aluminum, the rings are CNC sculpted for weights starting at just 48g. Helix R 3-bolt rings are available in the most popular -3mm offset, in sizes 28-34T, and in the spectrum of e*thirteen colors. Elevate your 3-Bolt Cranks, diversify drivetrains, reduce weight, and bring a new aesthetic to your bike with the Helix R 3-Bolt Chainrings.