Praxis Works MTB eRing Steel 1x Chainring 34T 104 BCD Narrow WCold forged, high grade 4130 grade steel designed specifically for E Bikes and longer wear These e rings are female threaded. A regular male M8 CR bolt threads directly into this threaded e ring for motor clearance. Mount with the logos facing outward Narrow Wide tooth profile for better chain retention Works with 1x10 11 12sp Shimano, KMC and SRAM Eagle, Flat and T type chains Must use a clutch type rear derailleur. Ex: Shimano Shadow or SRAM Type2