Strong bite, good braking effect, short braking distance, low sound, stop at a brake, safer riding. The gear ratio is strong and rigid, and it is well integrated with the chain, and the riding force is not lost. The plastic-coated design prevents the trouser legs from being caught in the chainring and ensures safe riding. Lightweight alloy frame, lightly loaded, can ride faster, high-strength structure combination makes the frame more rigid and safer to ride. The off-road wide tires are suitable for various road conditions. The lightweight carcass has an ingenious pattern arrangement, which greatly improves the tire grip and speed. Shifting performance, good hand feeling, accurate positioning and convenient operation, no delay or misalignment during shifting.