104bcd Round 40/42 Tooth Narrow/Wide Mountain Bike Chainring - Style B - Black

Specifications: The disc is made of high-quality, durable material. Integrated CNC machining ensures increased strength and extended use. The narrow and wide tooth design provides optimal chain retention, extended lifespan, and reduces friction and noise. Thanks to this design, you'll no longer have to worry about derailments and you'll be able to easily tackle rough roads. Type: Bicycle Chainring Material: Aluminum Alloy Number of Teeth: 40/42 Features: Style A: 40 teeth, Style B: 42 teeth Advantages: Durable, stable, easy to use Style A: Diameter: 168 mm (approx.) Style B: Diameter: 177 mm (approx.) Disc Thickness: 4 mm, Positive Tooth Thickness: 3.5 mm, Negative Tooth Thickness: 1.9 mm / 0.07", Bolt Hole Diameter: 75 mm / 2.95" (approx.) Notes: The chainring bolt circle diameter (BCD) is 104 mm. The buyer must ensure their crankset has a BCD of 104 mm (the diameter of the circle formed by the centers of the four chainring mounting holes is 104 mm). An incorrect BCD will prevent installation. Due to differences in lighting and screen settings, the item's color may slightly differ from the pictures. Please allow for slight dimension differences due to manual measurement. Package contents: 1 x Bicycle chainring (screws not included)