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wolf-tooth-elliptical-107-bcd-chainring-38t-compatible-with-sram-107-bcd-drop-stop-b-4-bolt-black, The Wolf Tooth Elliptical 107 BCD Chainring for SRAM cranks is compatible with most new SRAM 1x road cranks that use the 107 BCD spider, including the SRAM AXS Power Meter Spider. This chainring uses the patented Wolf Tooth Drop-Stop B Wide/Narrow tooth profile that is optimized for drop bar bikes and designed best wear life, mud clearance and chain retention.Elliptical chainring shape provides better efficiency in the recovery zone, as well as increased traction thanks to consistent torqueDrop-Stop chainrings are designed for use with 1x9, 1x10, 1x11 and 1x12 drivetrainsCompatible with all 10-, 11-, and 12-speed chains, with the exception of Shimano 12-speed chainsShimano 12-speed chains require the use of Wolf Tooth's Shimano 12-speed specific chainringsFits 107 BCD spidersMade from 7075-T6 aluminum for long life