Wolf Tooth Elliptical 107 BCD Chainring – 42t Compatible with SRAM 107 BCD Drop-Stop B 4-Bolt Black. The Wolf Tooth Elliptical 107 BCD Chainring for SRAM cranksis 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.

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