The Smooth Shifting Rear Mech Pulley Wheel is a top-quality product that is perfect for mountain road folding bikes. With its engineering plastic frame and precision CNC design, this gear component ensures a smooth and effortless shifting experience, especially when tackling steep terrains. The high-quality ball bearings within the drive shaft provide a smooth, quiet, and long-lasting operation, ensuring optimal performance and durability. This rear mech pulley wheel is available in an 18T size, which is great for speedier and more efficient pedaling on your mountain bike, making it an essential investment for any avid cyclist. With its sleek and stylish design, this gear component will also add a touch of modern sophistication to your bike.