This 7075-T6 aluminum alloy chainwheel is lightweight and high-strength for road, BMX, and mountain bikes. Precision machining and anodic oxidation electroplating provide a smooth surface, bright color, and corrosion resistance. The narrow wide tooth design increases the grasp force and prevents chain dropping, making it easy to conquer bumpy roads. Fits various bike cranks with 104mm BCD and is compatible with 9/10/11 speed. Available in 32T, 34T, 36T, and 38T sizes. Features: - Light weight but also high strength. - Fit for various kinds of bike crank which BCD is 104mm. - Precision machining and anodic oxidation electroplating, keep medals smooth surface, bright color, not faded and corrosion resistance. - The narrow wide tooth design increasing the contacting 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 dorpped, easy to pass through the bumpy road. Specifications: Material: 7075-T6 aviation aluminum alloy Range: 32T, 34T, 36T, 38T Compatibility: 9/10/11 speed Size/BCD: 104BCD Package Included: 1 104 BCD Narrow Wide Chainring Notes: 1. Manual measuring, please allow 1 ~ 3mm error, thank you. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the picture.