Features: Our road bike double chainring features a 50+34T/52+36T/53+39T configuration craft from aluminum compound metal, suitable for 8-12 speed systems for multiple cycling needs. Designs with a hollows crank structure, this chainwheel significantly reduces overall bike weight, enhancing biking efficiency and speed, ensures power transmission. Ideal for road cycling enthusiasts, folding bike users, professional racers, and DIY modification fan seek high performances component to elevating their cycling experience. Perfect for city commuting, casual ride, mountain adventure, and competitive race, ensuring smooth gear shifts and reliable performances across diverse terrains. With its modern aesthetic and delicate design, this chainring not only meets functional demands but also satisfies the desire for style and individuality in your biking setups. Specifications: Materials: Aluminum Compound Metal Color: As The Picture Shows Type: 50-34T/52-36T/53-39T (Optional) Diameter: approx.25cm/9.84in (More Size Detail, Please See Picture.) Package Includes: 1Pc Road Bike Double Chainring note: Please allow 1-2cm error due to manual measurement. Please make surer you not mind before your bid. Due to the differences between different monitors, the picture may not reflect the actual color to the item. Thanks!