RaceFace Narrow Wide Chainring - Direct Mount CINCH, 30t – The Path Bike Shop
For Shimano 8-11 Speed Bike Round Oval Narrow Wide Chainring 104bcd 30-42T Crank | eBay
Amazon.com : M-Wave Unisex Adult PD-R4-S-NW E-Bike Chain Ring for 1/2 x 3/32 & 11/128 Inch Chains for Brose, Bosch, Shimano, Bolt Circle 104 mm, Black, 20 x 20 x 1 cm :