104 BCD Chainring CNC Mountain Bike Chainring for BMX Road Bike Most Black 42T

104 BCD Chainring CNC Mountain Bike Chainring for BMX Road Bike Most Black 42T.Bike Narrow Wide Chainring is Made of aluminum alloy, CNC cutting, with positive and negative designed to prevent the chain from dropping, strong force.Crank BCD ( hole distance) is 104mm, inner diameter is 88mm/3.46inch.Mud discharge oblique mouth to prevent sediment accumulation.The thickness of each tooth is processed , which can work seamlessly with the outer and inner of the chain to suit your riding, and reduces friction and noise.The anode colored to prevent oxidation, so that an oxide film can formed on the aluminum surface, which effectively protects the aluminum alloy body. Anti rust, durable.Bike Chainring is Suitable for most 104BCD cranks, please make sure your crank BCD and number of tooth specification carefully before purchasing.Mountain bike chainring 104 bcd narrow wide. CNC Aluminum Alloy 4 Hole Mountain . Single Chainring 7 8 9 10 11S Speed Round. Chainwheel Positive Negative Road BMX replacement. Repair Parts Accessories Replace chain rings.