The bike rims brake set works by squeezing two brake pad against the rims of wheel creating frictions that slows down the rotation of wheel. Make of high strength iron, wear-resistant, antirust and strong, not easily deformed. The brake pad is wear resistant and enduring, and the grooves on it can improve braking efficiency to make cycling safe. Suitable for 20-26inch road bikes with mechanical brake. Easily to install, none modification is required. The front and rear wheel is used together for better braking and . Practical bicycles repair accessories to ensures travel .