With this legendary single gear, Wolftooth kick-started its production into the form we know today. The derailleur is made of durable and lightweight aluminum that, thanks to the Wide/Narrow tooth profiling, will last far more miles than competing derailleurs from other companies. It fits on 130 BCD five-arm cranks. For use in harsh conditions, a chain guide and derailleur with a guide brake are recommended. The perfect choice for cyclocross, gravel or touring bikes. The tooth profiling is designed for 9, 10, 11 speed and 12 speed Sram Eagle chains as well as Sram FlatTop chains of 12 speed sets. Not compatible with Shimano DA 9000 / Ultegra 6800 Campagnolo CX10/11.