absoluteBLACK SRAM 3-Bolt Direct Mount 0mm Offset (Superboost) Oval ChainringabsoluteBLACK Oval Direct Mount 1x Chainrings for SRAM 3 Bolt cranks are designed for SRAM cranks that have a 3 bolt direct mount interface. Direct mount chainrings provide significant weight savings over a standard spider and chainring combination. They are crafted from CNC machined 7075 aluminum, and feature an anodized finish for exceptional durability. Ovality has been optimized for each chainring size, ranging from 10. 2 14. 4%, with timing of