Bicycle Front Derailleur FD-TY300 3 x 6/7 Speed Up/Down Swing, Bike Derailleur 3 Speed with Adjust Clamp Size 31.8mm 34.9mm for Mountain Bike Road Bicycle

About this item Model Front derailleur FD-TY300 Down swing 31.8mm, 3×6/7-speed. Please carefully check whether the front derailleur of your bike is a pull-Down type before buying, if yours is a pull-Up type, it is not applicable. Compatible tooth ratio 42T, drawing mode: up double pull, installation diameter: 31.8mm. Double SIS positioning 47.5-50mm chain center line compatible with wide chain design, improve variable speed response, extend service life. Features Clamp Band Mount, 3×6/7-speed. Made of high strength aluminum alloy material, strong and durable, lightweight design.Implementing a weight reduction design to make your riding more comfortable. Principle of speed change The speed change line pulls the guide chain piece to toggle the chain, so that the chain runs on different tooth pieces of the tooth disk, realizing the tooth ratio of different speeds, making the riding more effortless and faster.