This dust cover for the hollow integrated crankset of bicycles is specially designed for mountain bikes and road bikes. It has a specification that fits hollow cranksets with a bore diameter of 22 - 25mm. It can precisely match numerous bike models, making the installation process easy and smooth, and bringing you a great fitting experience. Made of aluminum alloy, it has excellent quality. The aluminum alloy material is strong and durable, effectively withstanding various abrasions and collisions during daily cycling. It can protect your crankset and bottom bracket for a long time, reducing the entry of dust, debris, etc., minimizing the wear and tear of components, and extending their service life, thus safeguarding your cycling. In terms of its use, it plays a crucial protective role. It prevents impurities such as dust, dirt, and rainwater from invading the inside of the crankset and bottom bracket, ensuring the smooth operation of the bicycle's transmission system. This allows you to experience more stable and efficient power transmission during cycling. Whether you're speeding on flat roads or traversing rough mountainous areas, it can provide reliable protection for your ride. This product has been recognized by consumers in many regions and is selling well in Europe, South America, Southeast Asia, North America, Northeast Asia, the Middle East, and other places.