Bike Chainring Asymmetrical 104BCD Narrow Wide Tooth MTB for Shimano M370, M410, M670, M780 Jiankun IXF Cranks, Some Haomeng Cranks, 7/8/9/10/11/12 Speed Aluminum 38T

104BCD Asymmetric: Shimano M370, M410, M670, M780 Jiankun IXF cranks, some Haomeng cranks and so on. Tips: The diameter of the circle formed by the center points of the four pin holes is 104 mm, and the pin is designed without sink., Aluminum 7075 & CNC Process: Aluminum 7075 ensure it is lightweight but stiffness. Full CNC makes the precision size and nice surface looking. 38T is 80.5g only. Aluminium alloy 7075,light weight but high strength., Narrow Wide Tooth:The narrow wide tooth design, increasing the contact area with the chain greatly,so that each of the teeth can be fully inserted into the chain,increase the grasp force,make you no longer worried about the chain dropped., Single Chainring: Through the single speed chainrings,reduced the transmission system greatly,completely abandoned the complex variable speed system,reduce the bike weight at least 1kg,looks more compact and simple and also greatly improve your speed