VXM 104BCD 40T/42T Round Mountain Bike Narrow Wide Chainring Sprocket Single Speed Bicycle Crank Chain Wheel Cycling Parts AccessoriesFeature: 104BCD discs: for M370, M410, M610, M670, M780, for Jiankun IXF cranks, fro part of Hao Meng discs and so on.Adopt high-speed CNC machine tools in one piece to ensure the strength and beauty, not fade, beautiful atmosphere.Gear ratio change is more continuous, no need to change the gear of front and rear dial at the same time to achieve a continuous gear ratio.Specification: Name: Narrow Wide Round ChainringMaterial: aluminum alloy 7075Color: red, blackSpecification: 40T, 42TWeight: about 90g, about 115gOutside diameter: about 169mm/6.65in, about 177mm/6.97inDisc type: round discBCD: 104mmApplicable crank: 104mm BCDCompatible with :8/9/10/11/12 speed chains of major brandsReminder.The BCD is 104mm, so if you buy the crank, please make sure your crank is 104BCD (the diameter of the circle formed by the center point of the four pegs is 104mm), don't get it wrong, or you can't install it.Note:1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you!2. Please allow 1-2cm measuring deviation due to manual measurement. 1 X Narrow Wide Round Chainring