5DEV Aero Road/Gravel Chainring Cutting Through The Air Aerodynamics is important when it comes to saving those precious watts while riding. The 5DEV Aero Road/Gravel Chainring is a lightweight aerodynamic 1x ring that uses a SRAM 8-bolt pattern. It is compatible with SRAM Transmission, Shimano 12 Speed, and SRAM Eagle chains and it has Shark Fin Technology that reduces chain noise on 1x mullet builds with MTB cassettes. Features Lightweight aerodynamic 1x ring for gravel and road setups Designed for SRAM 8-bolt patterns Shark Fin Technology that reduces chain noise on 1x mullet builds with MTB cassettes Note: may not work with T47 BB's and is specifically designed to work with SRAM DUB Bottom Bracket Cups SPECIFICATIONSDrive Train Speed12-Speed Tooth Count42T, 52TMaterial Steel Direct Mount Type SRAM 8-Bolt Pattern Chainline-Offset-Intended Use Road, Gravel Weight N/AChainline/Chainring Offset Guidelines Rear Spacing135mm / 142mm148mm Boost Super Boost 150mm / 157mm Fat Bike (170mm, 190mm, 200mm)Chainline48 - 50mm51 - 53mm54 - 56mm56mm+Chainring Offset~6mm~3mm~0mm~+2mm | 5Dev | Aero Road/gravel Chainring | Black | 52T | Aluminum